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do (one's) homework
1. Literally, to complete school work that has been assigned to be done at home. You can't watch any more television until you do your homework!
2. To be thoroughly prepared and informed for something, such as a meeting, interview, or report. 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.
the dog ate my homework
A hackneyed explanation for why one does not have their homework. A: "I can't tell my teacher that the dog ate my homework!" B: "Come on, a bad excuse is better than none."
(The) dog ate my homework
A poor excuse for something that someone has failed to do on time. (From an excuse a student might give for failing to turn in homework on time. Occurs in many variations.) The dog ate my homework, so I have nothing to turn in. (Used as an attributive.) Bob was late with his report and had nothing but his typical dog-ate-my-homework excuses.
do one's homework
Be well prepared, as in Steve had done his homework before the meeting and could answer all of the client's questions . This usage transfers a school assignment to a broader context. [c. 1930]
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.