
This means to decide against a previous course of action after thinking about it, or in the wake of something happening that made you think twice about it: (Father to son) Smoking in school?! You are grounded for two months - no car, no tv and no computer! (next morning...) Son, last night I was thinking... I did the same thing when I was your age, so I've had a change of heart - I won't ground you for two months, but you'll have to wash all our cars this Saturday as punishment.