达成默契用英文怎么说?

come to an agreement

Reached a tacit understanding

与...达成默契
connive with;tacity understand beforehand

他们事先已达成默契，嘉莉得找份工作，付伙食费。
It had been tacitly understood beforehand that she was to get work and pay her board.

reach an agreement

在不同的情况下有不同的说法：
reach agreement by implication
reach an unvoiced pact
reach a tacit understanding (or agreement)
reach an unspoken consensus