Why is the ninth month called September?
c.1600, "a living creature, one who breathes," agent noun from breathe. Meaning "spell of exercise to stimulate breathing" is from 1836; that of "a rest to recover breath" is from 1901.
A person who makes harassing telephone calls and merely breathes, rather than talking, into the mouthpiece (1970s+)
heavy breather, mouth-breather