B2 [ I or T ] to become gradually damaged, worse, or less; to cause something to do this腐蚀;(使)衰败,(使)衰弱
More examples
Floating in the dirty river were dead fish, already starting to decay.
The bacteria live on food particles and produce acid that decays the enamel on your teeth.
The flesh on a dead body decays very rapidly.
It's sad to watch a beautiful rose wither and decay in such a short time.
Plants and animals decay into the soil, replenishing the minerals and nutrients.
C2 the process of decaying腐蚀;衰败,衰弱
More examples
Many children come to us with severe dental decay.
Unemployment and inner city decay are inseparable issues which must be tackled together.
Sugar is a major cause of tooth decay.
The mansion had an atmosphere of genteel elegance and decay.
Areas of the most serious urban decay are to receive funds for new building and redevelopment schemes.
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