From Longman Dictionary of Contemporary Englishhave a mind of your ownhave a mind of your owna) to have strong opinions about things, and make your own decisions without being influenced by other people She’s a woman without fear, with a mind of her own, who says what she thinks. b) if an object has a mind of its own, it seems to control itself and does not work or move in the way you want it to The bicycle seemed to have a mind of its own and I couldn’t steer it straight. → mind
Examples from the Corpus
have a mind of your own• She's a woman with a mind of her own, who says what she thinks.• Joey's only two, but he has a mind of his own.• I have a mind of my own.• But Mansell has a mind of his own, and he was adamant he would make racing his career.• They have minds of their own and will form their own views on what is put before them.• My hair seems to have a mind of its own today. 