vulcanism/ʹvulkəniz(ə)m/ noun

• off season
• offset
• offset litho
• offshoot
• offshore
• off side
• offside
• off somebody's hands
• offspin
• offspring
• offstage
• off (the) air
• off the beaten track
• off the cuff
• off-the-cuff
• off the ground
• off the hook
• off the pace
• off the peg
• off-the-peg
• off the record
• off-the-record
• off the shelf
• off-the-shelf
• off the top of one's head