She wants to restore an old theater that is 'falling into decay'. [=falling into ruin]
We're concerned about the 'decay' [='deterioration'] of our public school system.
Tomatoes that fall off the vine will 'decay' [='rot'] on the ground.
(..) Winston... You are thinking that my face is old and tired, that while I talk of power, I am unable to prevent the decay of my own body. But the individual is only a cell, Winston. The weariness of the cell is the vigour of the organism. - You'll fail. - Why? It's impossible. (..)1984 1984