second thought noun
VERB + SECOND THOUGHT have ~s | not give sth As for the money, don't give it a second thought.
PREP. on ~s On second thoughts, maybe I won't apply for the job after all. | without a ~ He dismissed the rumour without a second thought. | ~s about We're beginning to have second thoughts about buying a car.
You can also check other dicts: second thought (English, 中文解释 ), wordnet sense, Collins Definition