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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Double-up. Photo: Sean DaveySubscribe to view
Surfer on a double-up wave, Santa Cruz County, 1972Subscribe to view
![](https://cdn.sanity.io/images/f1hjpcr4/production/38807f16a19cba889e616bdb780defd902e0374c-900x506.jpg?w=640&h=360&q=65&auto=format)
Double-up. Photo: Sean Davey
![](https://cdn.sanity.io/images/f1hjpcr4/production/e23246beb83ca38269194b258d031da10cb4b17b-900x506.jpg?w=640&h=360&q=65&auto=format)
Surfer on a double-up wave, Santa Cruz County, 1972