I. phrasal
1. : enter , board , mount
got on the horse and rode away
2. : to produce an unfortunate effect on : disturb , upset
that sort of talk gets on my nerves
3. : to give attention or consideration to
doesn't know when to stop talking once he gets on music
4. : to subject to reprimand or punishment
promised to get on him for his negligence
II. transitive verb
: to dress oneself in : don
get on thy boots: we'll ride all night — Shakespeare
intransitive verb
1.
a. : to continue toward a destination : move along
finished his drink and said that he had to be getting on
b. : to continue with one's work or business : proceed
his desire to get on with his studies — T.B.Costain
c. : to draw near : come close
it was getting on to four in the morning, and he had not yet closed an eye — F.W.Crofts
d. : to become late
it was getting on in the afternoon and we were tired — L.A.Viereck
e. : to become old : age
I am indeed getting on … and a helpmate would cheer my declining days — W.S.Gilbert
2.
a. : to achieve success : progress , prosper
watched every opportunity because he wanted to get on — Robert Westerby
b. : to carry on one's affairs : fare , manage
the legacy … came after he was well started, and he always says he could have got on without it — Ellen Glasgow
3. : to maintain a friendly relationship : be on good terms
will she get on with your father's wife — Rose Macaulay
4. : to gain knowledge or understanding : grasp the meaning : catch on — used with to
he soon got on to the racket they were working
5. chiefly Britain : to make contact — used with to
I'll get on to the telephone people first thing in the morning — Dorothy Sayers