bum noun

1 person's bottom

VERB + BUM feel, pinch A man pinched her bum on the train so she hit him. | sit on They've been sitting on their bums all day, doing nothing.

2 lazy/useless person

ADJ. low-down, no-good | lazy | beach He dropped out of college and became a beach bum.

You can also check Google Dictionary: bum (English, 中文解释 )

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