1. To suggest or introduce something for one's consideration; to bring something to one's attention. It's an interesting proposal. I'll put it to the board of directors next week.

2. To accuse one of something with the intention of seeing whether they will deny it or can argue against it. Typically followed by "that" and the accusation. I put it to her that she had added a passage to her diary as a means of providing an alibi. I stormed into that meeting to put it to them that this policy is going to destroy many employees' careers.