松 + Complement
松 (sōng) means "to loosen," "to relax," or "loose" and can function as a verb or adjective. It describes the action of releasing tension or making something less tight, and also appears as a surname.
你把鞋带系得太紧了,松一松吧。
Nǐ bǎ xiédài jì de tài jǐn le, sōng yī sōng ba.
You've tied your shoelaces too tight; loosen them a bit.
工作了一整天,终于可以松口气了。
Gōngzuò le yī zhěng tiān, zhōngyú kěyǐ sōng kǒu qì le.
After working all day, I can finally relax a bit.
这颗螺丝松了,需要拧紧一下。
Zhè kē luósī sōng le, xūyào nǐng jǐn yīxià.
This screw is loose; it needs to be tightened.