Webster's English Dictionary

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swoop

1. swoop \'swu:p\ vb [alter. of ME swopen to sweep, fr. OE swa-pan; akin to 
   ON sva]tha to swathe - more at SWATHE : to move with a sweep; specif :  : 
   to make a sudden attack to carry off abruptly : SWEEP  - swoop.er n
2. swoop n : an act or instance of swooping