Wiktionary
hand-in-glove
a. (context idiomatic English) Closely cooperative. adv. (alternative spelling of hand in glove English)
Usage examples of "hand-in-glove".
Death and the devil have often been seen hand-in-glove by wiser visionaries than I.
An important official's daughter is discovered to be working hand-in-glove with the rebels.
Incidentally, you can now forget all that Peter told you - thank you, my boy, just give it to the lady - all he told you about Cipriano working hand-in-glove with the Partisans.
Ross and I are cousins, and it is true that we were hand-in-glove, but only to play a trick on Sir Gareth.
They say this organisation has worked hand-in-glove for many years with a network of secret agents controlled by you.