see a man about a horse

be a man

To put up with something or take responsibility for it; to deal with something, such as pain or misfortune, without complaining.

be one's own man

To behave independently without the influence of others.

be the bigger man

To walk away from a conflict to prevent it from escalating.

beat a dead horse

To persist or continue far beyond any purpose, interest or reason.

boldly go where no man has gone before

To break new ground.

broken man

A man who has suffered significant and enduring emotional pain as a result of a highly unpleasant or traumatic event.

charley horse

A muscle cramp, usually a strong one, in the thigh, leg, arm, or core.

close the stable door after the horse has bolted

To attempt to prevent a problem that has already occurred; to design and implement a preventive mechanism that is too late (after the first failure instead of before).