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on account of
because of something.
on acid
under the influence of a hallucinogenic drug
on all fours
Positioned with hands and knees on the ground.
on an irregular basis
happening inconsistently or infrequently
on and off
occurring intermittently, not continuously
on another note
changing the topic
on average
Typical or common amount or level.
on bad terms
not friendly or in conflict
on blast
To publicly criticize or expose someone.
on board
in agreement or involved with a plan
on cloud nine
to feel extremely happy or joyful
on cloud seven
In a state of great happiness.
on course
following a planned path or direction
on death's doorstep
Very close to dying or extremely sick.
on demand
whenever someone requests it.
on edge
Feeling nervous or anxious.
on end
in a vertical position for a long time.
on eternal patrol
always watching or guarding
on file
to have records or information stored
on fire
Doing exceptionally well or energetically.
on good terms
In a friendly relationship.
on hand
available for immediate use or assistance.
on hold
temporarily paused or waiting
on ice
Temporarily postponed or delayed.