Definition of undercount verb from the Oxford Advanced American Dictionary

 

undercount

 verb
verb
NAmE//ˌʌndərˈkaʊnt//
 
undercount somebody/somethingVerb Forms present simple I / you / we / they undercount he / she / it undercounts past simple undercounted -ing form undercounting
 
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to count fewer than the actual number of people or things in a particular group The census undercounts low-income people and children.