"Substinence" is probably misspelled. Trying subsidence instead Definition of subsidence
1
[ noun ] a gradual sinking to a lower level

Synonyms

subsiding settling

2
[ noun ] an abatement in intensity or degree (as in the manifestations of a disease)

Synonyms

remission remittal

Examples

"his cancer is in remission"

3
[ noun ] the sudden collapse of something into a hollow beneath it

Synonyms

cave_in

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