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затрепыхать v stresses
Gruzovik, inf.	begin to tremble (= затрепетать); begin to move (= затрепетать); begin to palpitate (= затрепетать); begin to stir (= затрепетать); become agitated (= затрепетать); begin to quiver (= затрепетать)
inf.	begin to flutter
затрепыхаться v
Gruzovik, inf.	begin to flutter; begin to move; begin to stir