Wiktionary
n. (context nautical English) A small jib, used in a storm to reduce the sail area to the minimum required for maintaining manoeuvrability of the vessel.
Usage examples of "storm jib".
With the storm jib up and the prop turning away they can now get a few degrees to the weather.
Reluctantly he'd told Southwick to hand both storm trysail and storm jib and set the storm foresail in their place.
Robyn watched him strip the canvas off the upper yards, taking in two reefs in the main and setting a storm jib so that Huron met the freak wind readily and ran in for Table Bay, giving Robben Island a good berth to port.
He put three reefs in the main and hooked up the storm jib that was hardly bigger than a hanky.
At the moment the Sutherland was forging slowly ahead under storm jib and close reefed topsails, two hundred yards to windward of the Pluto.