were worried about
definitions
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past tense of 'be worried about' for plural subjects; to feel anxious or concerned about something in the pastko: 복수 주체의'~에 대해 걱정하다'의 과거형; 과거에 무언가에 대해 불안하거나 걱정했다
examples
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They were worried about the delay in the project.
그들은 프로젝트의 지연에 대해 걱정했다.