# Double-up

> Two waves merging into one, creating a thicker, heavier lip and an unpredictable face.

**What "double-up" means in surfing:** Two waves merging into one, creating a thicker, heavier lip and an unpredictable face.

**Example:** "That set doubled up and slammed the reef."

**Also said:** Double up

**Category:** Waves

## Related words

- [Wedge](https://surfslang.com/wedge): A wave that jumps up suddenly when a second wave or backwash merges with it, making a steep, peaky shape.
- [Heavy](https://surfslang.com/heavy): Serious, dangerous or intense.
- [Closeout](https://surfslang.com/closeout): A wave that breaks along its whole length at once instead of peeling, leaving no open face to ride.

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Source: [Double-up](https://surfslang.com/double-up) on Surfslang.com, the surf slang glossary. Full glossary: https://surfslang.com/llms.txt