behind the curve
US /bɪˈhaɪnd ðə kɜrv/
UK /bɪˈhaɪnd ðə kɜrv/

1.
rezagado, atrasado
lagging behind current developments or trends; not up-to-date
:
•
Our company is behind the curve when it comes to adopting new technology.
Nuestra empresa está rezagada en cuanto a la adopción de nuevas tecnologías.
•
If you don't keep learning, you'll quickly find yourself behind the curve.
Si no sigues aprendiendo, rápidamente te encontrarás rezagado.