/ˌar.ɪˈviːst/ or /ar.ɪˈviːst/ (UK) /ar.ɪˈviːst/ (US)

Definitions

1. noun

A person who has acquired wealth or status by marrying into a wealthy family, and who is considered to be of inferior social standing or to have ‘married up’

“She was seen as an arriviste by her husband’s family, who thought her to be beneath them socially.”