sub ‧ side /səbˈsaɪd/ BrE AmE verb [intransitive]
[ Date: 1600-1700 ; Language: Latin ; Origin: subsidere , from sidere 'to sit down, sink' ]
1 . if a feeling, pain, sound etc subsides, it gradually becomes less and then stops SYN die down :
Simon waited until the laughter subsided.
The pains in his head had subsided, but he still felt dizzy and sick.
2 . formal if a building or an area of land subsides, it gradually sinks to a lower level:
After the heavy rains, part of the road subsided.
3 . if bad weather conditions subside, they gradually return to a normal state:
The wind gradually subsided, and all was quiet.
4 . if water, especially flood water, subsides, it gradually goes underground or back to a normal level:
When the floods subsided, the streets were littered with bodies.