Brown Driver Briggs

 1. to be bitter
  1) (Qal) to be bitter
  2) (Piel)
1b1. to show bitterness
1b2. to make bitter
  3) (Hiphil) to make bitter, embitter
  4) (Hithpalpel)
1d1. to embitter oneself
1d2. to be enraged
2. (TWOT) to be strong, strengthen