Also cop, cup. [app. contraction of co’up = come up: cf. dup = do up.]

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  1.  A call for domestic animals.

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a. 1825.  Forby, Voc. East Anglia, Coop, a common word of invitation to domestic poultry … to come … to peck up the food thrown down for them. It is, perhaps, an abbreviation of the words come up.

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1877.  E. E. Hale, Level Best., etc., 281. We brought up in front of the barn, from which we had already heard shouts of ‘Coop! Coop!’

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1883.  Hampshire Gloss., Coop, a word used in calling horses; particularly when in the field they are enticed by a sieve of oats to be caught.

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1888.  Sheffield Gloss., Coop, a call for cows.

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  2.  Coop or coop and seek (U.S.): the game of ‘hide and seek.’

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  Coop is the call of the hider when he is ready.

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1885.  I. N. Tarbox, Songs & Hymns for Common Life, 112.

        And then we play at coop and seek;
  The mystery is small;
We hide behind the nearest chair,
  Or in the open hall.

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