put ideas into head
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put ideas into someone's head
Fig. to suggest something-usually something bad-to someone (who would not have thought of it otherwise). Bill keeps getting into trouble. Please don't put ideas into his head. Bob would get along all right if other kids didn't put ideas into his head.
put ideas into somebody's head
to make someone want to do something they had not thought about doing before, especially something stupid (often in continuous tenses) Don't go putting ideas into his head. We haven't got the money for a car. Who put all these ideas into her head about becoming an actress?