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Phrase(s): creep across something
1. Lit. to move across something slowly and carefully; to sneak across something. • The soldiers crept slowly across the rope bridge. • The cat crept across the floor, stalking the mouse. 2. Fig. [for light, fog, etc.] to move slowly across a place or an area. • A heavy fog crept across the coastal areas. • The spotlight crept across the stage from one side to the other, as if looking for the performer.
McGrawhill's American Idioms And Phrasal Verbs