hem /hem/●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。