avoir du pain sur la planche

To have a lot of work still to do

These days it means having plenty left to do, though the phrase curiously used to mean the opposite: bread already baked and stored, with the work done.

Avec ce nouveau projet, j’ai du pain sur la planche pour les prochains mois.

With this new project, I have got plenty of work ahead of me for the next few months.

The dictionary maker Littré recorded an older form, avoir du pain cuit sur la planche, meaning your bread was already baked and you could rest. Over time the meaning flipped to the opposite: work still waiting to be done.