Definitions

1. noun

One that causes or is susceptible to mildew, especially a person with a tendency to become moldy or musty.

“The old, damp basement was home to a mildewer, causing its inhabitants to complain of constant odors.”

2. verb

To cause or become covered with mildew, especially to develop a musty or moldy smell.

“The stored furniture mildewed after being left in the damp attic for years.”