an attempt to convince someone of something; an attempt to try to get information out of someone; an attempt to try to train someone to do something. (The expressions with shot and crack are more informal than the main entry phrase. (*Typically: take ~; have ~; give someone ~.) Let me have a crack at him. I can make him talk. Let the new teacher have a try at Billy. She can do marvels with unwilling learners. Give me a crack at him. I know how to make these bums talk.

to take a turn at trying to do something. (*Typically: take ~; have ~; give someone ~.) All of us wanted to have a try at the prize-winning shot. Let Sally have a shot at it. If you let me have a crack at it, maybe I can be successful.