1. Required by rule
   "in most schools physical education is compulsory"
   - mandatory, required

See also: irremissible, obligatory

Encyclopedia: Compulsory

• give it the deep six
• give notice
• give off
• give one's best
• give or take
• give out
• give over
• give rise
• give suck
• give thanks
• give the axe
• give the bounce
• give the eye
• give the gate
• give the glad eye
• give the once over
• give the sack
• give tongue to
• give up
• give vent
• give voice
• give way
• give-and-go
• give-and-take
• give-up the ghost