Webster's English Dictionary

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scat

1. scat \'skat\ vi or scat.ted;  or scat.ting [scat, interj. used to drive 
   away a cat] 1: to go away quickly - often used interjectionally to drive 
   away an ani mal (as a cat) 2: to move fast : SCOOT 
2. scat n [perh. imit.] : jazz singing with nonsense syllables 
3. scat vi or scat.ted;  or scat.ting : to improvise nonsense syllables to 
   an instrumental accompaniment : si ng scat