cat that ate the canary
A person who appears self-satisfied or smug, especially while concealing something mischievous, prohibited, or private.
He talked freely and carried the smile of the cat that swallowed the canary.
canary
UK /kəˈnɛəɹi/ US /kəˈnɛəɹi/
noun 6verb 3adj 2
Definitions
noun
1
A small, usually yellow, finch (genus Serinus), a songbird native to the Canary Islands.
2
Any of various small birds of different countries, most of which are largely yellow in colour.
3
A female singer, soprano, a coloratura singer.
4
An informer or snitch; a squealer.
5
A light, slightly greenish, yellow colour.
adj
1
Of a light yellow colour.
verb
1
To dance nimbly (as in the canary dance).
but to jig off a tune at / the tongue's end, canary to it with your feet,
2
To inform or snitch, to betray secrets, especially about illegal activities.
3
To test a software change by rolling out to a small set of machines or users before making it available to all.
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