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second thought

or sec·ond-thought

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

second thought

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