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On one's hands
On one's honor
On one's last legs
On one's legs
on one's own
On one's own account
On one's own hook
on paper
On penalty of
on purpose
on request
On shore
On sufferance
on tap
on that
on that point
-- on the air --
on the alert
on the average
on the ball
On the beam
on the books
On the bow
on the button
On the cards
on the coattails
on the coattails of
on the contrary
On the docket
on the dole
on the dot
On the European plan
on the face of it

on the air

currently transmitting; live; - used of radio and television broadcasts, to indicate that the images and sounds being picked up by cameras and microphones are being broadcast at the present moment.

See also: Air

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