(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. I'm home from that work trip and happy as a clam. I can't wait to sleep in my own bed tonight!

(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. I've been happy as Larry ever since we moved to the countryside. I was happy as Larry in my sitting room surrounded by my three beautiful children.

(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. I'm home from that work trip and happy as the day is long. I can't wait to sleep in my own bed tonight!

*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.

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.

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.

happy as Larry

BRITISH, INFORMAL

If you are as happy as Larry, you are very happy. I gave her a police badge to wear on her sleeve and she was as happy as Larry. Note: `Larry' may refer to the successful Australian boxer Larry Foley (1847-1917). Alternatively, `Larry' may come from `larrikin', a 19th century word for a hooligan or ruffian, used mainly in Australia.

(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.

happy as the day is long/as a clam/as Larry