Capsizing, Overturn
noun, verbal noun
It revolves then capsizes. When a ship revolves onto its back and then capsizes, this causes capsizing.
てんぷく
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Watch out for the rendaku.
ワニだらけの沼沢で私のカヌーが転覆した時は、どっと冷や汗をかきましたよ。
I suddenly broke out in a cold sweat when my canoe capsized in a swamp full of alligators.