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puff something out
to cause something to swell out or expand outward. The frog puffed its throat out and croaked. The frog puffed out its throat and croaked a mighty croak.
to swell out. The frog's throat puffed out, and we expected to hear a croak. The sail puffed out, and the boat began to move.
1. To extend, stretch, or swell, by or as if by being filled: The sails puffed out as the breeze strengthened.
2. To cause something to extend, stretch, or swell outward: The wind puffed out the sheets that were hanging on the clothesline. Male birds will puff their chests out to appear larger.