掉以轻心
- na.let down [lower] one's guard
- 网络Lightly; treat; treat sth.lightly

掉以轻心
1.let down [lower] one's guard; be rid of sth. to lighten one's heart; dismiss the thought of the matter, etc. as unworthy of further attention; take [adopt] a casual attitude; take ... lightly; treat sth. lightly; trust sb. too lightly [readily; easily]; unwisely to believe in sb.'s words
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