口出怨言 meaning in English

be discontented and speak resentfully

Though they were now too cold and hungry to do more, they grumbled and cast sullen looks upon their leaders .
他们虽然又冷又饿，什么事情也干不动了，但还是口出怨言，不住地对他们的首领投射凶恶的眼光。
As the ruler of a kingdom , lu yang had to lead her troops ; if she faltered , some infuriated subordinate was sure to complain
身为一国之主，吕洋总是必须身先士卒，如果她稍有懈怠，总有红了眼的部下口出怨言。