noun
a quick look or brief observation
preposition
a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause
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She would often glance at her watch during the meeting to keep track of time.
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I caught him glancing at his phone while we were talking.
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I saw her give a quick glance at the cute guy across the room.
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When you glance at a problem without really understanding it, you'll never find a solution.