Mieć zaległości in inglese:

fall behind schedule and then catch up

we should not fall behind

In order not to fall behind China or India, we need immediate change.

Companies that choose not to do this will fall behind those that are dedicated to improvement and excellence.

Don't fall behind, let's walk together.

fall behind the rent

Your electricity will be cut off if you fall behind with the payments.

We started to fall behind with the rent.