As a Verb or Adjective: 1. Of a person trying to sleep, to be unable to sleep and to constantly change your position by turning and moving side to side. English = toss and turn. 2. Of a person in bed, to be unable to keep still, to be restless, and to be unable to sleep because you are worried by something. English = (be) sleepless. 3. Of a person on a flat surface, to roll about side to side for some reason. English = roll about. 4. To be extremely amusing or funny. English = hilarious.