Idioms

keep (something) under one's hat
to keep a secret, to not tell something
My coworker will not say where he is going for his holiday. He wants to keep it under his hat.

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  • keep (something) under wraps
  • keep a civil tongue
  • keep a close rein on (someone or something)
  • keep a close watch on (someone or something)
  • keep a close watch over (someone or something)
  • keep a secret
  • keep a stiff upper lip
  • keep a straight face
  • keep a tight rein on (someone or something)
  • keep abreast of (something)
  • Idioms Quiz
  • pull the plug
  • pat on the back
  • see the last of (someone or something)
  • sink one's teeth into (something)
  • in hot water
  • on speaking terms with (someone)
  • set (someone) back on his or her heels
  • no trespassing
  • hail from (somewhere)
  • not so hot


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    For a work entitled Self, created in 1991, English sculptor Marc Quinn made a copy of his head, moulded from his own deep-frozen blood. Quinn collected almost 4 litres (8 pints) of his blood over five months, poured it into a mould of his head and froze it.      .. More >>
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