off

adverb

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

   “He drove off in a cloud of smoke.”

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

   “Please switch off the light when you leave.”

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

   “He bit off the end of the carrot.”

4. Specifying the number of some item in bills, parts lists, etc.

   “3 off 20 amp fuses”

adjective

1. Inoperative, disabled.

   “All the lights are off.”

2. Cancelled; not happening.

   “The party's off because the hostess is sick.”

3. Not fitted; not being worn.

   “Your feet will feel better once those tight boots are off.”

4. Denoting something faulty, unsatisfactory, objectionable etc. Not correct; not properly formed; not logical, harmonious, etc.

   “This calculation is off: the numbers don't add up.”

preposition

1. Not positioned upon; away from a position upon.

   “He's off the roof now.”

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

   “The phone is off the hook”

3. Outside the area or region of.

   “The suspect is now believed to be off the campus.”

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

   “off work; off school”

verb

1. To kill.

2. To switch off.

   “Can you off the light?”

noun

1. Beginning; starting point.

   “He has been very obviously an untrustworthy narrator right from the off.”