give (one) second thoughts (about someone or something)

To cause one to reconsider someone or something; to cause one to begin to doubt a previous determination about or commitment to someone or something. Everyone thought his promotion was a done deal, but his unprofessional behavior during the interview gave the board of directors second thoughts about him. I was really excited about the chance to move to Portugal for a new job, but being so far away from all my friends and family is giving me second thoughts. They told me they were happy with the plan last week, so I have no idea what suddenly gave them second thoughts.

See also: give, second, someone, thought

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