Yes it is the past tense of the verb subside.The storm subsided over night.
The pain in his jaw subsided a few hours after the tooth extraction.
I usually delay my exit from arenas until after the crowd has subsided.
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The past tense of "subside" is "subsided."
the water level has a 70% of water
Fortunately, the pain subsided or it might have become insupportable.
After the floods subsided, the arks landed in Africa.
59cm3 if the wides is subsided with the correlation
Words that are opposite to subside:GrowAriseIncrease
Abated, caved-in, collapsed, declined, diminished, dwindled, etc.
"Subsided" means collapsed and fallen into a hole. I daresay there are schools so decrepit they might subside. There are probably many students who wish their schools had subsided. However, you are probably thinking of "subsidised" which means "partly paid for by another". A subsidised private school might be one party funded by tuition fees and partly by government grants, or one where part of the funding is taken up by a corporation or church.