yes-man

[ yes-man ]
/ ˈyɛsˌmæn /

noun, plural yes-men.

a person who, regardless of actual attitude, always expresses agreement with his or her supervisor, superior, etc.; sycophant.

Origin of yes-man

First recorded in 1910–15

British Dictionary definitions for yes man

yes man

noun

a servile, submissive, or acquiescent subordinate, assistant, or associate; sycophant