This shirt can't be machine washed, you need to drip-dry it by hanging it up.

drip-dry 是由 drip（滴落）和 dry（干燥）组成的复合动词，字面意思是"通过滴水来晾干"，指衣物不拧干而是挂着让水滴自然落下晾干的洗涤方式。