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flap
The physical sense of the word evokes a rhythmic, slapping sound and a lack of rigid control. It suggests a loose, repetitive motion that is often unintentional or instinctive, such as a flag in a storm or a startled bird. This creates a feeling of instability or erratic movement.
Countable when referring to a physical piece of material like a pocket cover or envelope lid. Uncountable when describing a general state of panic or agitation.
Meanings
To move something up and down or back and forth rapidly.
"The bird began to flap its wings to take off."
To move rapidly and irregularly in the wind.
"The laundry continued to flap in the breeze."
A flat piece of fabric or leather that hangs loosely and can be folded over.
"He fastened the flap of the envelope."
A state of agitation or panic.
"The office was in a total flap when the server crashed."