躡手躡腳

Simplified: 蹑手蹑脚

nièshǒunièjiǎo ㄋㄧㄝˋ ㄕㄡˇ ㄋㄧㄝˋ ㄐㄧㄠˇ

    • to walk quietly on tiptoe (idiom)

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Sources