/ səbˈsaɪd; NAmE / verb [ v ]
1.
to become calmer or quieter :
She waited nervously for his anger to subside.
I took an aspirin and the pain gradually subsided.
2.
( of water ) to go back to a normal level :
The flood waters gradually subsided.
3.
( of land or a building ) to sink to a lower level; to sink lower into the ground :
Weak foundations caused the house to subside.
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WORD ORIGIN
late 17th cent.: from Latin subsidere , from sub- below + sidere settle (related to sedere sit).