To tread lightly and hold one's breath; to move stealthily and quietly, often to avoid detection or disturbance.
为了不吵醒熟睡的孩子，她蹑足屏息地走进房间，生怕发出一点声响。
To avoid waking the sleeping child, she tiptoed and held her breath as she entered the room, fearful of making even the slightest sound.
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