To get back, to regain (a physical thing; in astronomy and navigation, sight of a thing or a signal).

“After days of inquiries, he finally recovered his lost wallet.”

To salvage, to extricate, to rescue (a thing or person)

“They recovered three of the explorers very much alive, then another, wracked with severe hypothermia, who was taken to hospital.”

To replenish to, resume (a good state of mind or body).

“At the top of the hill I asked to stop for a few minutes to recover my strength.”

To cover again.

(roofing) To add a new roof membrane or steep-slope covering over an existing one.