Someone who sells products or services by making unsolicited telephone calls.(noun)
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Use "telemarketer" in a sentence
"The FTC named Voice Touch Inc. and Transcontinental Warranty Inc., which it called the telemarketer and promoter of the scheme, respectively, in the lawsuits."
"Apparently the telemarketer is calling every phone number in an area, regardless of whether or not the number is on the Do Not Call list."
"Yesterday I was cold-called by a telemarketer from the (formerly) prestigious Roundabout Theatre Company."