時間がなくて相手をせかすときに言う「急いで」って英語でなんて言うの？

1. This is a very polite request.
2. This exclamation is urgent and asks the people in front to go quickly.
3. This is a blunt and imperative instruction to move quickly.

Any of these two sentences can be used:-
1. Hurry up! the train is about to leave.
To hurry up means to move or act quickly.

2. Let's get to stepping, the train is leaving soon!
   The expression "get to stepping" is an informal way of saying hurry up!

Hurry
- to move or do things more quickly than normal.

"Hurry or you'll be late."
"After spending her lunch hour shopping, she hurried back to the office."
"Come on - we're going to be late if you don't hurry!"
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Quick
- happening or done with great speed
"I tried to catch him but he was too quick for me."
"She was quick to point out that it wasn't her fault."
"I had a quick coffee and left the house."

When you are telling someone you want them to move quicker as you need to do something then you can simply say 'please hurry up!'
the common phrase for this is 'get a move on' meaning to move quicker