clam

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Related to clammed: clammer, clammed 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

happy as a clam at high tide

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 at high tide once I get this stupid cast off my leg.
See also: clam, happy, high, tide

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

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

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 at high tide once I get this stupid cast off my leg.
See also: clam, happy, high

(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

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

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

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

(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

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

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