make a stab at (something)
To attempt (to do) something; to take a turn trying (to do) something. Well, I haven't fixed a motor in nearly 10 years, but I'll certainly make a stab at it. You had your chance, now let your sister make a stab at trying to break the piñata.
make a stab at
Try to do something, as in I don't know the answer but I'll make a stab at it. This expression derives from stab in the sense of "a vigorous thrust." [Late 1800s] Also see make a pass at, def. 2.