HSK 7-9
不下
búxià动
to be not less than (a certain quantity, amount etc)
现场观众人数不下五千。
Xiàn chǎng guān zhòng rén shù bú xià wǔ qiān.
There were no fewer than five thousand spectators at the site.
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Appears across levels (7-9) in the HSK 3.0 word list.