clam

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(as) happy as a clam

Very joyful and contented. Look at your sister out there! She's happy as a clam now that she's back in the starting lineup again. I know I'll be as happy as a clam once I get this stupid cast off my leg.
See also: clam, happy

(as) happy as a clam in butter sauce

Very joyful and content. Look at your sister out there! She's happy as a clam in butter sauce now that she's back in the starting lineup again. I know I'll be happy as a clam in butter sauce once I get this stupid cast off my leg.
See also: butter, clam, happy, sauce

(as) happy as Larry

In very good spirits. The phrase's origin is unknown, but it may refer to Australian boxer Larry Foley. I was as happy as Larry when I found out that I'd gotten an A on my hardest exam.
See also: happy, Larry

(as) happy as the day is long

Very happy; contented. I've been happy as the day is long ever since we moved to the countryside. Johnny's in a bit of a bad mood, but just give him a new toy to play with and he'll be as happy as the day is long.
See also: happy, long

be (as) happy as a clam (at high tide)

To be very joyful and content. Clams are dug at low tide, so a clam at high tide would be able to remain uncaught. Look at your sister out there! She's happy as a clam at high tide now that she's back in the starting lineup again. I know I'll be happy as a clam once I get this stupid cast off my leg.
See also: clam, happy, high

clam up

To suddenly stop talking or refuse to speak, typically due to a particular reason. The phrase refers to a clam closing its shell. Naturally, everyone clammed up as soon as the check came. Our usual informant clammed up when he realized there was a mole in the department.
See also: clam, up

close as a clam

Safe from harm. Likened to a clam closing its shell to protect itself. All of the doors and windows are locked. Don't worry, we'll be close as a clam in here.
See also: clam, close

(as) happy as a clam at high tide

Very joyful and content. Clams are dug up at low tide, so a clam at high tide would be able to remain uncaught. Look at your sister out there! She's as happy as a clam at high tide now that she's back in the starting lineup again. I know I'll be happy as a clam at high tide once I get this stupid cast off my leg.
See also: clam, happy, high, tide

shut up like a clam

1. adjective Silent or laconic. Johnny's been shut up like a clam ever since he came back from the party. I hope he's OK. This town is always shut up like a clam after 9 PM. It's so boring!
2. verb To stop talking and refuse to speak. Whenever I ask her about her love life, she just shuts up like a clam.
See also: clam, like, shut, up
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

clam up

to say nothing. (Closing one's mouth in the way that a clam closes up.) The minute they got him in for questioning, he clammed up. You'll clam up if you know what's good for you.
See also: clam, up

*happy as a clam (at high tide)

 and *happy as a clam (in butter sauce); *happy as a lark; *happy as can be
contented; very happy. (*Also: as ~.) I've been as happy as a clam since I moved to the country. I don't need much. Just somewhere to live, some work to do, and a TV to watch, and I'm happy as a clam at high tide. Matthew was happy as a lark throughout his whole vacation. Bob was happy as can be when he won the lottery.
See also: clam, happy
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

clam up

Refuse to talk or respond, as in Whenever she asks her teenager about his activities, he clams up. This term alludes to the tightly closed valves of a live clam. [Slang; early 1900s]
See also: clam, up

happy as the day is long

Also, happy as a lark; happy as a clam (at high tide). Extremely glad, delighted, very cheerful, as in He was happy as the day is long, or When she heard the news she was happy as a lark, or Once I got the test results I was happy as a clam at high tide. The first of these similes dates from the late 1700s. The second alludes to the lark's beautiful, seemingly very happy, song. The third, from the early 1800s, alludes to the fact that clams can only be dug at low tide and therefore are safe at high tide; it is often shortened to happy as a clam.
See also: happy, long
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

shut up like a clam

If you shut up like a clam, you become very quiet and do not communicate with people because you are upset. When a teenager is worried, they may well shut up like a clam, not wanting to tell you what's wrong. Later, when I found I wasn't his only love, I shut like a clam and let no one close.
See also: clam, like, shut, up

happy as a clam

AMERICAN
If you are happy as a clam, you are very happy. Join the other kids. Do that, and before you know it you'll be happy as a clam.
See also: clam, happy
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

(as) happy as the day is ˈlong/as a ˈclam/as ˈLarry

(informal) very happy: Grandpa’s as happy as a clam helping the children to fly their kites.
See also: clam, happy, Larry, long
Farlex Partner Idioms Dictionary © Farlex 2017

clam up

v. Slang
To refuse to talk or to stop talking suddenly: The politician clammed up when the reporters started to ask about the scandal.
See also: clam, up
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

clam

1. n. a dollar. (Underworld.) You got a couple of clams I can bum for a little bottle?
2. n. a tight-lipped person. Suddenly, she became a clam and wouldn’t talk anymore.

clam up

in. to get quiet. (see also dummy up.) The minute they got him inside the cop-shop, he clammed up.
See also: clam, up
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.

happy as a clam (at high tide)

Delighted with one’s lot. An American expression dating from the early nineteenth century, it comes from clamming, which involves digging clams out of the sand at low tide. At high tide it is difficult, if not impossible, to dig for clams. Safety thus is the obvious reason for the mollusk’s carefree state of mind.
See also: clam, happy, high
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in periodicals archive ?
She said fisheries administration officials have asked local fishermen and traders not to sell clams to Vietnamese traders.
During the summer of 2002, mortalities were noted in wild clams in Raritan Bay, NY.
"It's a plumper clam," said Butch Yamali, the founder of The Dover Group, whose restaurants and catering facilities include Peter's Clam Bar.
We ran a MANOVA restricted to the first four days of the experiment (six to nine days post-fertilization) to test for initial or immediate length differences between clams in the control and inoculated groups.
The notice states: "This closure has been imposed for fishery management purposes and is intended to conserve and protect razor clam stocks."
Corbicula clams are originally from temperate and tropical locations, including in Asia, Africa, and Australia, although they are most often known as Asian clams.
The best time of day to start your quest for clams is at low tide, when the water recedes from the shore.
In 2012, van der Heide and colleagues proposed that in some seagrass communities, clams burrowing among the plant roots help detoxify sulfides.
The powerful machine has been modified to allow it extract hundreds of thousands of clams over a 15 square metre stretch of the Shannon.
The Grand River clams could not breathe easy with the closing of Clements' company.
littleneck clams (about 41/2 dozen), scrubbed 2/3 cup dry white wine, such as Sauvignon Blanc
Electro-pulse fishing uses a current to stun razor clams from the seabed.
CLAMS were thrown back into the sea amid concerns about commercial harvesting on a beach yesterday.