The Collaborative International Dictionary of English v.0.48:

Swat \Swat\ (sw[o^]t), n. [Also spelled swot.]
   1. a sharp blow, especially one made with an instrument in
      the hand.

   2. (Baseball) a powerful hit, especially a home run.

WordNet (r) 3.0 (2006):

swot
    n 1: an insignificant student who is ridiculed as being affected
         or boringly studious [syn: swot, grind, nerd, wonk,
         dweeb]
    v 1: study intensively, as before an exam; "I had to bone up on
         my Latin verbs before the final exam" [syn: cram, grind
         away, drum, bone up, swot, get up, mug up, swot
         up, bone]