Definitions

1. noun

a gentle, affectionate sound, especially one made by a horse or other animal

“She patted the horse on the neck and heard the soothing chuff of its breath.”

2. verb

to make a loud, exasperated sound, typically in exasperation or amusement

“He chuffed with laughter at the silly joke.”

3. verb

to produce steam, especially in an old-fashioned locomotive

“The old locomotive chuffed along the track, its steam engine puffing out clouds of vapor.”