| noun | a movable airfoil that is part of an aircraft wing; used to increase lift or drag |
| noun | any broad thin and limber covering attached at one edge; hangs loose or projects freely “he wrote on the flap of the envelope” |
| noun | an excited state of agitation “he was in a dither” |
| noun | the motion made by flapping up and down |
| noun | a movable piece of tissue partly connected to the body |
| noun | a movable airfoil that is part of an aircraft wing; used to increase lift or drag |
| verb | move in a wavy pattern or with a rising and falling motion “The curtains undulated” |
| verb | move noisily “flags flapped in the strong wind” |
| verb | move with a thrashing motion “The bird flapped its wings” |
| verb | move with a flapping motion “The bird's wings were flapping” |
| verb | make a fuss; be agitated |
| verb | pronounce with a flap, of alveolar sounds |
| dither | verb | make a fuss; be agitated |
| pother | verb | make upset or troubled |
| fuss | verb | worry unnecessarily or excessively |
| flap | verb | make a fuss; be agitated |
| flutter | verb | move back and forth very rapidly |
| roller | noun | a long heavy sea wave as it advances towards the shore |
| undulation | noun | wavelike motion; a gentle rising and falling in the manner of waves |
| flap | noun | the motion made by flapping up and down |
| flapping | noun | the motion made by flapping up and down |
| wave | noun | a movement like that of a sudden occurrence or increase in a specified phenomenon |
| beat | noun | a regular rate of repetition |
| dither | noun | an excited state of agitation |
| pother | noun | an excited state of agitation |