To be suspected or implicated in something without concrete evidence, often despite being innocent; to be under a cloud of suspicion.
他虽然没有直接参与那件事，但因为他和嫌疑人走得太近，难免让人觉得无丝有线
Although he was not directly involved in that matter, his close association with the suspect inevitably made people feel there was suspicion without direct evidence.
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