1 like the cat that ate/got/swallowed the canary | Definition of like the cat that ate/got/swallowed the canary

like the cat that ate/got/swallowed the canary

idiom

Definition of like the cat that ate/got/swallowed the canary

US
used to say that someone looks very proud or satisfied about something he or she has done After pointing out his teacher's mistake, he smiled like the cat that ate the canary.