Meaning:

to write a short letter or notice/ to contact someone

Synonyms:

drop a letter/call

Sentences：

Don’t forget to drop us a line whilst you’re away.

Drop a line when you get back.

I hope you’ll drop me a line soon

If you’ve got a few minutes to spare you could always drop

her a line.

Conversation 1

A: I haven’t talked to Eileen in ages

B: You should drop her a line.

A: I think I will. I really miss her.

B: Hey, good friends are hard to come by.

Conversation 2

A: When are you going on holiday?

B: I’m off next week.

A: Are you scared about flying by yourself?

B: Not really, I’ll drop you a line when I get there to let you know that I arrived safely

A: That would be great, thanks

Conversation 3

A: Your mother called last night while you were out.

B: Yeah, I don’t really want to talk to her at the moment, maybe I’ll drop her a line and let her know that I’m ok

A: Why don’t you want to talk to her?

B: She keeps telling me how much she wants me to come home.

Conversation 4

A: I’m going off fruit-picking next month so I don’t know if I will be able to use my mobile or the internet

B: Ok, how will you let me know when you are coming back?

A: I’ll drop you a line, there must be a postbox somewhere