掉以輕心
📂 chengyudiào yǐ qīng xīn
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Meaning
to let one's guard down, to be careless
Examples
不能掉以輕心。
We can't let our guard down.
他掉以輕心，結果輸了比賽。
He let his guard down and lost the match.
面對疫情，不可掉以輕心。
We must not be careless when facing the pandemic.
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