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second thought

or sec·ond-thought

See more synonyms on Thesaurus.com
noun
  1. Often second thoughts. reservation about a previous action, position, decision, judgment, or the like: He had second thoughts about his decision.
Idioms
  1. on second thought, after reconsideration: On second thought, I don't think I'll go.

Origin of second thought

First recorded in 1625–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for on second thought

second thought

noun
  1. (usually plural) a revised opinion or idea on a matter already considered
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.