WordReference Random House Learner's Dictionary of American English © 2017
ˈyes-ˌman,  n.[countable]pl.  -men. 
  1. a person who always agrees with superiors, no matter what his or her own personal beliefs are.

WordReference Random House Unabridged Dictionary of American English © 2017
yes-man  (yesman′),USA pronunciation n., pl.  -men. 
  1. a person who, regardless of actual attitude, always expresses agreement with his or her supervisor, superior, etc.;
  • 1910–15

Collins Concise English Dictionary © HarperCollins Publishers::

yes man n
  1. a servile, submissive, or acquiescent subordinate, assistant, or associate; sycophant

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