Definition from Wiktionary, the free dictionary
- To turn upside down. Commonly used for boats and ships that capsize and turn through 180° so their hulls are above their superstructure, but it can refer to any vehicle in a similar position.
- (surfing) To roll upside-down with one's surfboard (usually a longboard) to allow a wave (usually an already broken wave) to pass over.
- 1998: a surfer prepares to turn turtle in the righthand shot — Kite Aerial Photography