OK that will do是不是习惯用语?什么意思?

OK that will do是不是习惯用语?什么意思?OK that will do,谷歌翻译：确定将执行 （第一感觉也是这个意思,但是……,看下面）that will do ,谷歌翻译：used to order somebody to stop doing or saying something （制止行动或说话）行啦,够啦 搞不明白了,究竟是肯定的话还是不耐烦的敷衍?