n.打电话的人;来访者;呼叫者
The telephonist asked the caller to hold on while she connected him. 话务员要打电话的人别挂断电话,她替他接通电话。
The priest is a rugelar caller. 这位神父经常来访。
The voice of the caller alerted her. 呼唤者的声音使她警觉起来。