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caller ID

noun
🔊/ˌkɔːlər ˌaɪ ˈdiː/
🔊/ˌkɔːlər ˌaɪ ˈdiː/
 [uncountable]
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  1. a system that uses a device on your phone to identify and display the phone number of the person who is calling you（电话的）来电显示系统Topics Phones, email and the internetc2