松于用英语怎么说

"松于" is a Chinese expression that means "to relax or loosen" and it can be translated into English as "to loosen up." It can be used to describe the physical act of relaxing or loosening something, or it can be used metaphorically to describe a person who is less tense or more relaxed.

The origin of this expression is not clear, but it is likely derived from the Chinese character "松," which means "loose" or "relaxed."

Here are some examples of "松于" in English, along with their translations into Chinese:

"I need to loosen up before my big presentation." (我需要在我的大型演讲前松于一下。)
"The knot in my shoulder is finally starting to loosen up." (我肩膀上的结终于开始松于了。)
"He's always so uptight, I wish he could loosen up a bit." (他总是那么紧张，希望他能松于一点。)