When you rethink, you consider something again, often reaching the opposite conclusion. You'll rethink your decision to go bungee jumping as soon as you're standing at the top of a tall bridge getting ready to jump.

You'll have to rethink your usual two A.M. bedtime after you get a new job making donuts at five every morning. A kindergarten teacher might also need to rethink his laid-back teaching style when he's faced with an especially high-energy class. You can also use rethink as a noun: "I need to have a quick rethink about what I'll have for lunch, since the cafeteria is out of French fries."

Definitions of rethink
  1. verb
    change one's mind
    “He rethought his decision to take a vacation”
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    modify one's opinion, make it less strong
    change one's mind and assume the opposite viewpoint
    type of:
    believe, conceive, consider, think
    judge or regard; look upon; judge
  2. noun
    thinking again about a choice previously made
    synonyms: afterthought, reconsideration, second thought
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    type of:
    change of mind, flip-flop, reversal, turnabout, turnaround
    a decision to reverse an earlier decision
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