work a treat

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work a treat

To work or function perfectly or very smoothly. After we oiled it up a bit, that old thing worked a treat. See, you just have to insert your card here and you can pop the door right open. Works a treat!
See also: treat, work

work a ˈtreat

(British English, informal) be very effective or successful: His idea worked a treat.
See also: treat, work