helpline
noun [ C ] uk/ˈhelp.laɪn/ us/ˈhelp.laɪn/
（为来电者提供咨询服务或排忧解难的）电话服务热线
a service providing advice and comfort to worried or unhappy people on the phone
A new helpline is now available for people trying to stop smoking. 对于那些想戒烟的人，现在有一条新的服务热线可供咨询。