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to get into a panic; to be flustered; to panic; to get in a flap
突然の事態に、皆が慌てふためいた。
Everyone panicked at the sudden turn of events.
予期せぬ事態に慌てふためいて、彼は逃げ出した。
Flustered by the unexpected situation, he ran away.
彼は少しの困難でもすぐに慌てふためく人だ。
He is the kind of person who panics immediately even at the slightest difficulty.