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.

Denoting something faulty, unsatisfactory, objectionable etc.

1. Not correct; not properly formed; not logical, harmonious, etc.

   Not correct; not properly formed; not logical, harmonious, etc.

   Inappropriate; untoward.

   Less than normal, in temperament or in result.

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

   Rancid, rotten, gone bad.

   Disgusting, repulsive, abhorrent.

   Circumstanced.

   Started on the way.

   Far; off to the side.

   Temporarily not attending a usual place, such as work or school, especially owing to illness or holiday.

   (Should we delete this sense?) Unavailable; unable to stay in a band or come to a club due to being busy with activities or schedules.

   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.

   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.

   Temporarily not attending (a usual place), especially owing to illness or holiday.

   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.

   Under the influence of.

   As a result of.

   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