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Adverb:
on all fours
On
hands
and
knees
"he got down on all
fours
to
play
with his
grandson
"
Encyclopedia:
On all fours
on
on a higher floor
on a lower floor
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