waste of breath

breath of fresh air

Something relieving, refreshing, or new.

don't hold your breath

Don't wait. Said cynically to suggest that what has just been mentioned is unlikely to happen soon or at all.

draw one's last breath

To die.

hold one's breath

To wait expectantly for something to happen soon.

save one's breath

To refrain from speech; to be quiet, especially where it would have no useful effect to speak.

take a breath

to inhale and subsequently exhale air

take a deep breath

To inhale deeply.

take someone's breath away

To make a person feel emotionally moved in a pleasant way.