tilt at windmills

Fig. to fight battles with imaginary enemies; to fight against unimportant enemies or issues. (As with the fictional character, Don Quixote, who attacked windmills.) Aren't you too smart to go around tilting at windmills? I'm not going to fight this issue. I've wasted too much of my life tilting at windmills.

to waste time trying to deal with enemies or problems that do not exist We're not tilting at windmills here. If we don't do something about these problems, our environment may be in serious danger.

Engage in conflict with an imagined opponent, pursue a vain goal, as in Trying to reform campaign financing in this legislature is tilting at windmills. This metaphoric expression alludes to the hero of Miguel de Cervantes' Don Quixote (1605), who rides with his lance at full tilt (poised to strike) against a row of windmills, which he mistakes for evil giants.

To confront and engage in conflict with an imagined opponent or threat.

Fight imaginary enemies or fight a battle that can't be won. “Tilt” means “joust,” as in mounted knights fighting each other with lances. In Miguel Cervantes's Don Quixote, the Man of La Mancha came upon a row of windmills and took them for giants, their flailing arms ready to do battle. Despite his squire Sancho Panza's pointing out that they were windmills, Don Quote set his lance, spurred his steed Rocinante, and charged the “enemy.” Alas for the Knight of the Woeful Countenance, the windmills prevailed. Anyone who similarly takes on a losing cause is tilting at windmills.