hand in glove
hand in glove or hand and glove {adj.} or {adv. phr.}
Very close or friendly; working together; in very close agreement or cooperation, especially for bad purposes.
The Navy and the Coast Guard work hand and glove, especially in war time.
Judges and others in high office sometimes are hand in glove with gangsters to cheat and steal.
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Source: A Dictionary of American Idioms
