be suspicious of
definitions
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to have doubts about someone or something; to distrustja: 〜に疑いを抱く;〜を疑う
examples
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The police were suspicious of the man's behavior.
警察はその男の振る舞いに疑いを抱いた。
The police were suspicious of the man's behavior.
警察はその男の振る舞いに疑いを抱いた。