second thought noun
plural ∼ thoughts [count] : a feeling of guilt, doubt, worry, etc., that you have after you have decided to do something or after something has happened
▪ After she agreed to lend him the money, she had second thoughts. ▪ She was having second thoughts about getting married. ▪ They throw away perfectly good food without (so much as) a second thought. [=without worrying about it] ▪ Don't give a second thought to [=don't worry about] that broken vase. ▪ He hardly gave it a second thought.
▪ After she agreed to lend him the money, she had second thoughts. ▪ She was having second thoughts about getting married. ▪ They throw away perfectly good food without (so much as) a second thought. [=without worrying about it] ▪ Don't give a second thought to [=don't worry about] that broken vase. ▪ He hardly gave it a second thought.
on second thought (US) or Brit on second thoughts
: after thinking about something again
▪ On second thought, I think I'll go after all.
▪ On second thought, I think I'll go after all.
