Picks their moment - Idioms by The Free Dictionary
pick (one's) moment (redirected from picks their moment)
pick (one's) moment
To be circumspect and prudent when deciding the best moment to act. Sometimes used ironically to suggest the opposite. I suggest picking your moment before you ask the boss for a raise. Wow, she broke up with him on his birthday? She really knows how to pick her moment.
pick/choose your ˈmoment carefully choose the right time to do something: I wanted to make sure she agreed, so I picked my moment, when she was in a good mood. ♢ (ironic) You told her you wanted a divorce two days after her operation! You really picked your moment, didn’t you?