Etymology
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subside (v.)

1680s, of objects, "to sink to the bottom," from Latin subsidere "sit down, settle, sink, fall; remain; crouch down, squat," from sub "under, beneath" (see sub-) + sidere "to settle," related to sedere "to sit," from PIE root *sed- (1) "to sit." Of liquid surfaces, "to sink to a lower level, be reduced" from 1706. Related: Subsided; subsiding.

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Definitions of subside

subside (v.)
wear off or die down;
The pain subsided
Synonyms: lessen
subside (v.)
sink to a lower level or form a depression;
the valleys subside
subside (v.)
sink down or precipitate;
the mud subsides when the waters become calm
Synonyms: settle
subside (v.)
descend into or as if into some soft substance or place;
She subsided into the chair
Synonyms: sink
From wordnet.princeton.edu