do (one's) homework(redirected from did their homework)
do (one's) homework
1. Literally, to complete the school work that has been assigned by a teacher to be done at home. You can't watch any more television until you do your homework!
2. To be thoroughly prepared and informed about something or something, especially in advance of some process, action, or decision. Be sure you do your homework before heading into that meeting; there's a lot at stake, and no one's going to like it if you aren't up to speed. I always do my homework before I make big purchases.
do your homework
If you do your homework, you prepare for something, especially by finding out information about it. Before you buy any shares, do your homework. Doing your homework before you make your request will help you to have a confident manner.