「休む」 (yasumu) means "to rest" or "to take a break." It can also mean "to be absent" from work or school. It's an intransitive verb, indicating a period of relaxation or a pause from activity, or taking a day off.

「休(やす)む」は、体(からだ)を休(やす)めたり、学校(がっこう)や会社(かいしゃ)を休(やす)む動詞(どうし)です。