"decays" in the noun sense
the process of gradually becoming inferior
2. decay, decline
a gradual decrease as of stored charge or current
3. decay, decomposition
the organic phenomenon of rotting
an inferior state resulting from the process of decaying
"the corpse was in an advanced state of decay"
"the house had fallen into a serious state of decay and disrepair"
5. decay, radioactive decay, disintegration
the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
"decays" in the verb sense
1. disintegrate, decay, decompose
lose a stored charge, magnetic flux, or current
"the particles disintegrated during the nuclear fission process"
2. decay, crumble, dilapidate
fall into decay or ruin
"The unoccupied house started to decay"
undergo decay or decomposition
"The body started to decay and needed to be cremated"
Source: WordNet® (An amazing lexical database of English)
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