cold-calling

noun
🔊/ˌkəʊld ˈkɔːlɪŋ/
🔊/ˌkəʊld ˈkɔːlɪŋ/
[uncountable]
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  1. the practice of phoning somebody that you do not know, in order to sell them something推销商品的电话Topics Phones, email and the internetc2, Businessc2