second thought

or second-thought

noun

1. Often second thoughts. reservation about a previous action, position, decision, judgment, or the like:

   He had second thoughts about his decision.

second thought

noun

1. usually plural a revised opinion or idea on a matter already considered

Word History and Origins

Origin of second thought¹

First recorded in 1625–35

Idioms and Phrases

Idioms

1. on second thought, after reconsideration:

   On second thought, I don't think I'll go.

Example Sentences

These, if unsettled by dire arbitrament of the sword, must be left to Time and his best coadjutor, "sober second-thought."

From Project Gutenberg

You do not want self-criticism of an obviously second-thought kind in them.

From Project Gutenberg