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
(..) We received the results from the mRNA sequences this morning. They were disappointing. Define "disappointing." Another dead end. It's the decay rate algorithm. - And this is to be expected. - Expected? You said you were close. We are close, but it's gonna take time. (..)2012 The Amazing Spider-Man
(..) Go on. Where are you going? There's something... ...your mom and I have to do. What is this? "Zero, zero, decay rate algorithm." Yeah, one sec, one sec. Come in. You okay? - Yeah. What's up? - Oh, my God. (..)2012 The Amazing Spider-Man