steal up on   (TTS發音)

approach sb. slowly and quietly悄悄地走近；偷襲

    Her friend stole up on her and made her jump. 她的朋友悄悄走近她，使她跳了起來。

    A small party stole up on the bridge under cover of darkness. 一支小分隊趁黑夜偷襲這座橋。