cat that swallowed the canary, (look) like the

cat that swallowed the canary, (look) like the

Look both smug and guilty. The analogy dates back to the mid-nineteenth century and was used by many writers, especially mystery writers (Dashiel Hammett among them), in the first half of the twentieth century.
See also: cat, like, swallow, that
The Dictionary of Clichés by Christine Ammer
See also:
  • cat got your tongue, has the
  • turn over in one's grave, (enough to make one)
  • bottle up feelings, to
  • past history
  • keep your eyes peeled/skinned
  • way to a man's heart, the
  • more power to you/him/them
  • heart in the right place, to have one's
  • bet one's bottom dollar, one can
  • fighting mad