double-up

Two separate waves merged into one; distinguished, as it breaks, by a midface step or terrace. A double-up wave is stronger and more dangerous than a regular wave, and can be totally unridable. But under the right circumstances, it might also provide the biggest, widest, most spit-filled tube of a surfer's life. British surfer and PhD-holding oceanographer Tony Butt believes that double-up waves ...

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