suck-out

A wave, or section of wave, that suddenly becomes extremely steep, hollow, and hard-breaking. Suck-outs are almost always caused by the wave moving abruptly over a shallow area of sandbar or reef. Suck-out waves often "double up" or even "triple up," meaning a scalloped ridge appears on the wave face. A manageable suck-out can provide a great tuberide, while a difficult or unexpected suck-out can ...