cap·size 
(kăpsīz′, kăp-sīz)
(kăpsīz′, kăp-sīz)intr. & tr.v. cap·sized, cap·siz·ing, cap·siz·es
To overturn or cause to overturn: The boat capsized; I capsized the canoe.
[Perhaps from Spanish capuzar, to load a ship so that its bow sinks (perhaps alteration of chapuzar, to duck, push underwater, from Vulgar Latin *subputeāre : Latin sub-, sub- + puteus, well; see PIT1), or from Spanish cabezar, to pitch (from cabeza, head, from Vulgar Latin *capitia, from Latin caput, capit-; see CAPE2).]