敲钉钻脚

qiao1 ding1 zuan1 jiao3

to make doubly sure (idiom)

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敲钉钻脚

qiāo dīng zuān jiǎo

make assurance doubly sure

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敲釘鑽腳|敲钉钻脚 [qiāo dīng zuān jiǎo] ► to make doubly sure (idiom)