Definition of "sour" []

• Having a taste characteristic of that produced by acids; sharp, tart, or tangy. (adjective)
• Made acid or rancid by fermentation. (adjective)
• Having the characteristics of fermentation or rancidity; tasting or smelling of decay. (adjective)
• Bad-tempered and morose; peevish: a sour temper. (adjective)
• Displeased with something one formerly admired or liked; disenchanted: sour on ballet. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "She tried to shake him off, but his fingers tightened and she sat still, her expression sour as he began to pour healing energy into her."
• "“Uh-huh,” Kaitlynn replied, her expression sour as she looked Ariana up and down."
• "Ex surveyed the circle of dirt, his expression sour."