waste one's breath
Speak in vain (because no one agrees), as in Don't waste your breath complaining to the supervisor—it won't help. This notion was first recorded about 1400 as wasting words. The exact idiom was first recorded in 1667. Also see save one's breath.
Words nearby waste one's breath
waste disposal unit,
waste gate,
waste heat recovery,
waste land, the,
waste not, want not,
waste one's breath,
waste pipe,
waste product,
waste well,
wastebasket,
wasted