hold in in WordNet English dictionary

1. lessen the intensity of; temper; hold in restraint; hold or keep within limits
   "moderate your alcohol intake"; "hold your tongue"; "hold your temper"; "control your anger"
   control  hold in  hold  contain  check  curb  moderate 
   
2. hold back; keep from being perceived by others
   "She conceals her anger well"
   conceal  hold back  hold in 
   
3. close in; darkness enclosed him"
   enclose  hold in  confine