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Adverb:
on approval
For
examination
(with an
option
to
buy
)
"they
took
the
VCR
on
approval
";
-
on appro
[Brit, informal]
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
on duty
on earth
on edge