preposition

 

one side to another from one end or side of something to the other

The River Seine flows through Paris.

 

start to end from the start to the end of something

He worked through the night.

 

because of because of someone or something, or with someone's help

I got the job through my mum's friend.

 

until from a particular time until and including another time

The store is open Monday through Friday.

 

adverb

 

from one side to another from one end or side to another

He opened the door and walked through.

 

telephone connected to someone by telephone

I tried to phone David but I couldn't get through.

 

adjective

 

to have finished using something or doing something

Let me know when you're through with the iron.

 

A through train goes all the way from one place to another place without the passenger having to change trains.