be cocksure of (oneself)(redirected from be cocksure of herself)
be cocksure of (oneself)
To be completely certain of oneself or one's actions, to the point of overconfidence. You seem pretty cocksure of yourself—do you really know how to handle that machine?
See also: of
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.