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Meaning of perpetual check

perpet'ual check'

Pronunciation: [key]
— Chess. Chess.
  1. a continuing series of checks resulting in a drawn game because they cannot be halted or evaded without resulting in checkmate or a serious disadvantage.
  2. the situation in which this occurs.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.