From Longman Dictionary of Contemporary Englishpester powerˈpester ˌpower noun [uncountable] the ability that children have to make their parents buy things or do things for them by asking them again and againFrom Longman Business Dictionarypester powerˈpester ˌpower [uncountable] informalMARKETING the ability that children have to make their parents buy things by asking for them again and againSmart companies are trying to harness pester power as kids increasingly influence their parents’ brand choices. → power