亲密无间

qīnmìwújiàn

be on intimate terms

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as thick as thieves

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qin1 mi4 wu2 jian1

close relation, no gap (idiom); intimate and nothing can come between

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亲密无间

qīn mì wú jiàn

be on very intimate terms with each other; be hand and (in) glove with each other; be thick with sb.; closely united; feel (be) very close to each other; not keeping anything from each other; on intimate terms

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親密無間|亲密无间 [qīn mì wú jiān] ► close relation, no gap (idiom); intimate and nothing can come between