Duck boat

[xoxoxoBruce]

cap·size /ˈkapˌsīz/
verb: capsize; 3rd person present: capsizes; past tense: capsized; past participle: capsized; gerund or present participle: capsizing
(of a boat) overturn in the water. "the craft capsized in heavy seas"
Similar: overturn, turn over, turn upside down, upset, upend

capsize verb
cap·​size | \ ˈkap-ˌsīz , kap-ˈsīz\
capsized; capsizing
Definition of capsize
transitive verb
: to cause to overturn
capsize a canoe
intransitive verb
: to become upset or overturned : TURN OVER
the canoe capsized

Meaning of capsize in English
capsize verb [ I or T ]
UK /kæpˈsaɪz/ US /kæpˈsaɪz/
to (cause a boat or ship to) turn upside down by accident while on water:
A huge wave capsized the yacht.
When the boat capsized we were trapped underneath it.

capsize | AMERICAN DICTIONARY
capsize
verb [ I/T ]
US /ˈkæpˌsɑɪz/
to turn over or cause a boat or ship to turn over in the water:
[ I ] A passenger ferry capsized in rough seas Sunday morning.

I always picture capsize as completely upside down. The dictionary kind of hints at that but there's still a lot of leeway.