[] to change and become more difficult or less pleasant or friendly; to make sth do this (使)变坏,恶化◆What will happen if the economy sours? 如果经济形势恶化,将会怎麽样?◆Weak job prospects soured spirits. 疲软的工作前景使士气低落。●go/turn ˈsourto become unpleasant or bad; to fail 变坏;恶化◆The deal started to go sour. 这笔交易开始出现问题。