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Adverb:
on and off
Not
regularly
"they
phone
each other on and off";
-
off and on
Encyclopedia:
On and off
on a par with
on a regular basis
on a roll
on a tear
on account
on account of
on air
on all fours
on an individual basis
on an irregular basis
on and off
on and on
on appro
on approval
on average
on balance
on board
on call
on camera
on cloud nine
on demand