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.
(..) We really don't know the long-term effects. What we're trying to do is prevent endothelial growth... which, when overexpressed, can contribute to disease, decay... vascular inhibition... and the spread of the tumors we're working so hard to eradicate. The survival rate of patients (..)2014 The Fault in Our Stars