um /ʌm/ ●ˌum and ˈaah (about sth) ( ˌhum/ˌhem and ˈhawless frequent) (informal) speak but say nothing important because you need more time to think about a problem, matter, etc.支支吾吾；敷衍◆He ummed and aahed for about half an hour and then finally said he would lend me the money. 他哼儿哈儿地磨叽了半个小时，最后才说他会借钱给我。◆After a lot of umming and aahing, he finally said yes to the plan. 他支吾了大半天，终于同意了这项计划。NOTEUm, aah, etc. are sounds that people make when they hesitate or do not know what to say next. * um、aah等词是人们犹豫不决或不知道该说什么话时发出的声音。