keep up with the joneses

/kˈiːp ˌʌp wɪððə dʒˈəʊnzɪz/

/kˈiːp ˌʌp wɪððə dʒˈoʊnzᵻz/

to keep up with the joneses

to constantly try to gain what one's friends and acquaintances have in order not to fall behind them