get off

1.  Dismount, leave a vehicle, as in She got off the horse right away, or Let's get off the train at the next stop. [Late 1600s]
2.  Start, as on a trip; leave. For example, We got off at the crack of dawn. [Mid-1700s]
3.  Fire a round of ammunition; also, send away. For example, He got off two shots, but the deer fled, or I got off that letter just in time.
4.  Escape from punishment; also, obtain a lesser penalty or release for someone. For example, He apologized so profusely that he was sure to get off, or The attorney got her client off with a slap on the wrist. This sense is sometimes amplified to get off easy or get off lightly. Where there is no punishment at all, the expression is sometimes put as get off scot-free, originally meaning "be free from paying a fine or tax (scot)," dating from the 1500s. [Mid-1600s]
5.  Remove, take off, as in I can't seem to get this paint off the car. [Second half of 1600s]
6.  Succeed in uttering, especially a joke. For example, Carl always manages to get off a good one before he gets serious. [Mid-1800s]
7.  Have the effrontery to do or say something. For example, Where does he get off telling me what to do? [Colloquial; early 1900s]
8.  Experience orgasm, as in She never did get off. [Slang; first half of 1900s]
9.  Also, get off of one. Stop bothering or criticizing one, as in Get off me right now! or If you don't get off of me I'm walking out. [Slang; c. 1940] Also see get off on; off one's back.

Definition: depart
Antonyms: arrive

The verb has 11 meanings:

Meaning #1: leave a vehicle, aircraft, etc.
  Antonym: get on (meaning #2)

Meaning #2: be relieved of one's duties temporarily

Meaning #3: transfer
  Synonyms: send, send off

Meaning #4: cause to be acquitted; get off the hook; in a legal case

Meaning #5: escape potentially unpleasant consequences; get away with a forbidden action
  Synonyms: get away, get by, get out, escape

Meaning #6: enjoy in a sexual way

Meaning #7: get off (a horse)
  Synonyms: unhorse, dismount, light, get down

Meaning #8: get out of quickly
  Synonym: hop out

Meaning #9: send via the postal service
  Synonym: mail

Meaning #10: get high, stoned, or drugged
  Synonyms: trip, trip out, turn on

Meaning #11: deliver verbally