Английский словарь американских идиом - look like the cat that ate the canary

or look like the cat that swallowed the canary {v. phr.} To seem very self-satisfied; look as if you had just had a great success. * /Peter bet on the poorest horse in the race and when it won, he looked like the cat that ate the canary./ * /When she won the prize, she went home looking like the cat that swallowed the canary./