unlearn
verb [ T ] uk/ʌnˈlɜːn/ us/ʌnˈlɝːn/
改掉，抛弃（旧习）
to make an effort to forget your usual way of doing something so that you can learn a new and sometimes better way
I had to unlearn the way I played guitar when I started taking formal lessons. 开始正规学习吉他的时候，我不得不丢掉以前弹吉他的习惯。