The philosopher presented a new ontological proof to support the existence of a necessary being.

We built a proof-of-concept to demonstrate the new algorithm.

These ceramic mugs are labeled dishwasher proof, so you can clean them without worrying about damaging the glaze.

The lab technician stored the samples in an acid-proof container to prevent corrosion.

I assigned several proofs by contradiction on the homework to help students practice indirect reasoning.

The paper was criticized for relying too heavily on proofs by example instead of offering general arguments.

We installed rot-proof decking around the seaside cottage to avoid costly repairs.

She paid a premium for the artist's proof because it bore the painter's personal signature and showed subtle variations from the regular edition.

Before backfilling the trench, the contractor inspected the damp proofing to ensure the foundation would be protected from rising moisture.

Before the book went to press, the editor carefully marked up the galley proof for typographical errors.