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Phrase(s): glance back (at someone)
1. to look quickly at someone who is looking at you. • He glanced back at Mary, so he could remember her smile. • She hoped he would notice her but he never even glanced back. 2. to look quickly at someone who is behind you. • Dan glanced back at the man chasing him and ran on even faster. • He glanced back and ran faster.
McGrawhill's American Idioms And Phrasal Verbs