dumper, noun

A large wave that can overwhelm a swimmer or surfer, propelling them down into the water or onto the beach.
2013 fishingowl.co.za (DSAE Corpus)If this happens on hitting a "dumper" the whole hull can collapse and bilge pumps are of no use whatsoever.
2014 seals.ac.za (DSAE Corpus)The 3.8m swell at 10 sec was reduced to a 2 foot puffy dumper under the protection of the point.
2014 assitej.org.za (DSAE Corpus)A swell approaching a steep sandbank will have a big dumper type wave.
A large wave that can overwhelm a swimmer or surfer, propelling them down into the water or onto the beach.
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20132014
dump, nounn.dump truck, noun phrasen. phr.
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