to move stealthily and hide one's tracks; to keep out of sight and remain unnoticed; to act furtively.
他悄悄地溜进了房间，蹑影藏形，生怕惊动了熟睡的孩子。
He quietly slipped into the room, moving stealthily, fearing he would wake the sleeping child.
Next Idiom
to move stealthily and hide one's tracks; to keep out of sight and remain unnoticed; to act furtively.