HSK 7-9
不惜
bùxī动
not stint; not spare; not hesitate (to do sth); not scruple (to do sth)
为了救人他不惜冒险下水。
Wèi le jiù rén tā bù xī mào xiǎn xià shuǐ.
He did not hesitate to risk entering the water to save someone.
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Appears across levels (7-9) in the HSK 3.0 word list.