Wings flap
Meaning: This means that birds move their wings up and down in order to fly. It's like saying, When a bird wants to take off, it needs to flap its wings quickly.
Choice of Words: Wings is a plural noun representing the modified forelimbs of birds that are used for flying. Flap is a verb that means to move or strike with force. In this context, 'wings flap' suggests that birds are moving their wings up and down in order to fly.
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