second thought

or sec·ond-thought

See more synonyms for second thought on
  1. Often second thoughts. reservation about a previous action, position, decision, judgment, or the like: He had second thoughts about his decision.
  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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for second thought

second thought

  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