What is the meaning of Off?

In a direction away from the speaker or other reference point.

Into a state of non-operation or non-existence.

So as to remove or separate, or be removed or separated.

Offstage.

Used in various other ways specific to individual idiomatic phrases, e.g. bring off, show off, put off, tell off, etc. See the entry for the individual phrase.

Inoperative, disabled.

Cancelled; not happening.

Not fitted; not being worn.

Rancid, rotten, gone bad.

Disgusting, repulsive, abhorrent.

Less than normal, in temperament or in result.

Inappropriate; untoward.

Circumstanced.

Started on the way.

Far; off to the side.

Designating a time when one is not strictly attentive to business or affairs, or is absent from a post, and, hence, a time when affairs are not urgent.

Designating a time when one is not performing to the best of one's abilities.

Presently unavailable.

On the side furthest from the kerb (the right-hand side if one drives on the left).

In, or towards the half of the field away from the batsman's legs; the right side for a right-handed batsman.

Not positioned upon, or away from a position upon.

Detached, separated, excluded or disconnected from; away from a position of attachment or connection to.

Used to indicate the location or direction of one thing relative to another, implying adjacency or accessibility via.

Used to express location at sea relative to land or mainland.

Removed or subtracted from.

No longer wanting or taking.

Out of the possession of.

Placed after a number (of products or parts, as if a unit), in commerce or engineering.

To kill.

To switch off.

Beginning; starting point.

often, frequently

Alternative spelling of ov

to have day off

to switch off; to turn off

Clipping of offline.

or

Introduces an indirect question, a doubt. if, whether.

either ... or

off-screen

off-Broadway; minor-league; small-time

Source: wiktionary.org