pester power
noun [ U ] informal uk/ˈpes.tə ˌpaʊər/ us/ˈpes.tɚ ˌpaʊ.ɚ/
缠功（儿童吵着要父母购买东西的能力）
the ability that children have to make their parents buy something, by asking for it many times until they get it
Advertisers know how powerful pester power can be. 广告商了解儿童缠功有多么强大。