Jiffy reef

See slab reefing — a rapid reefing method where a fixed reef point is pulled down to the boom and the extra cloth gathered and tied off.

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Related J-terms

Jury rig

An improvised, temporary repair or substitute — for example, replacing a broken mast with …

Jibe

(Also 'gybe') To change tack by turning the stern through the wind, allowing the mainsail …

Jibe oh

The skipper's command warning the crew that the mainsail is about to swing — the command t…

Jib

The small triangular headsail set forward of the mast, tacked to the stemhead and hanked, …

Jackstay / Jackline

A wire, webbing strap, or spliced rope run fore-and-aft along each sidedeck, to which a sa…

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