Definition (沟通)
To write a short, informal letter or message to someone.
给某人写信（尤指简短的非正式信件）。
I'll drop you a line after I move to let you know my new address.
我搬家后会给你写封信，让你知道我的新地址。
Please drop me a line to let me know how you are doing, if you have time.
如果你有时间，请给我写封信让我知道你的近况。
I'm going to drop her a line to see if she can make it to our party.
我打算给她写封信，看看她能不能来参加我们的派对。