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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.
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.
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.