capsize /kæpˈsaɪz/verb 3noun 1forms 3 verb3 •To overturn.Baby, I think I'm capsizing / The waves are rising and rising — 1982 •To cause (a ship) to overturn.But what if carrying sail capsize the boat? — 1819 •To deform under stress.There are even cases where a totally different knot may result when carelessly pulled. Tie the Granny Knot around any object and pull one end, and it will capsize into Two Half Hitches. — 1944 noun1 •The act of, or occurrence of capsizing or overturning. formscapsized · capsizing · capsizes