second thought
or sec·ond-thought
noun
Often second thoughts.
reservation about a previous action, position, decision, judgment, or the like: He had second thoughts about his decision.
Idioms for second thought
on second thought,
after reconsideration: On second thought, I don't think I'll go.
Origin of second thought
First recorded in 1625–35
Words nearby second thought
second sex,
second sheet,
second sight,
second story,
second string,
second thought,
second thoughts,
second to none,
second tooth,
second unit,
second vatican council
British Dictionary definitions for on second thought
second thought
noun
(usually plural)
a revised opinion or idea on a matter already considered
Idioms and Phrases with on second thought
on second thought
Resulting from a revised opinion or change of mind, as in I thought I'd go to the movies, but on second thought I'd rather stay home. Similarly, have second thoughts means “change one's mind,” as in I've had second thoughts about moving to Florida. This idiom alludes to ideas that come later. [Mid-1600s]