What is On-off?

On-off definition and meaning on Dictionary terms:
so as to be no longer supported or attached: This button is about to come off.
so as to be no longer covering or enclosing: to take a hat off; to take the wrapping off.

away from a place: to run off; to look off toward the west.
away from a path, course, etc.; aside: This road branches off to Grove City.
so as to be away or on one’s way: to start off early; to cast off.
away from what is considered normal, regular, standard, or the like: to go off on a tangent.
from a charge or price: He took 10 percent off for all cash purchases.
at a distance in space or future time: to back off a few feet; Summer is only a week off.
out of operation or effective existence: Turn the lights off.
into operation or action: The alarm goes off at noon.
so as to interrupt continuity or cause discontinuance: Negotiations have been broken off.
in absence from work, service, a job, etc.: two days off at Christmas.
completely; utterly: to kill off all the inhabitants.
with prompt or ready performance: to dash a letter off.
to fulfillment, or into execution or effect: The contest came off on the appointed day.
into nonexistence or nothingness: My headache passed off soon.
so as to be delineated, divided, or apportioned: Mark it off into equal parts.
away from a state of consciousness: I must have dozed off.
Nautical. away from the land, a ship, the wind, etc.

so as no longer to be supported by, attached to, on, resting on, or unified with: Take your feet off the table! Break a piece of bread off the loaf.
deviating from: off balance; off course.

below or less than the usual or expected level or standard: 20 percent off the marked price; I was off my golf game.
away, disengaged, or resting from: to be off duty on Tuesdays.
Informal. refraining or abstaining from; denying oneself the pleasure, company, practice, etc., of: He’s off gambling.
away from; apart or distant from: a village off the main road.
leading into or away from: an alley off 12th Street.
not fixed on or directed toward, as the gaze, eyes, etc.: Their eyes weren’t off the king for a moment.
Informal. from (a specified source): I bought it off a street vendor.
from or of, indicating material or component parts: to lunch off cheese and fruit.
from or by such means or use of: living off an inheritance; living off his parents.
Nautical. at some distance to seaward of: off Cape Hatteras.

in error; wrong: You are off on that point.
slightly abnormal or not quite sane: He is a little off, but he’s really harmless.

not up to standard; not so good or satisfactory as usual; inferior or subnormal: a good play full of off moments.
no longer in effect, in operation, or in process: The agreement is off.
stopped from flowing, as by the closing of a valve: The electricity is off.
in a specified state, circumstance, etc.: to be badly off for money.
(of time) free from work or duty; nonworking: a pastime for one’s off hours.
not working at one’s usual occupation: We’re off Wednesdays during the summer.
of less than the ordinary activity, liveliness, or lively interest; slack: an off season in the tourist trade.
unlikely; remote; doubtful: on the off chance that we’d find her at home.
more distant; farther: the off side of a wall.
(of a vehicle, single animal, or pair of animals hitched side by side) of, being, or pertaining to the right as seen from the rider’s or driver’s viewpoint (opposed to near): the off horse; the off side.
starting on one’s way; leaving: I’m off to Europe on Monday. They’re off and running in the third race at Aqueduct.
lower in price or value; down: Stock prices were off this morning.
Nautical. noting one of two like things that is the farther from the shore; seaward: the off side of the ship.
Cricket. noting or pertaining to that side of the wicket or of the field opposite that on which the batsman stands.


reference: www.dictionary.com/browse/on-off