To escape from prison.

(Britain, slang) An irresponsible young man, seeking personal pleasure and gratification without any regard to responsibilities. A rogue.

Alternative spelling of jack of all trades

(mineralogy) A pyroxene mineral, a sodium aluminium silicate with the chemical formula Na(Al,Fe³⁺)Si₂O₆, found in metamorphic rocks.

(usually plural) One of the pieces used for the game called jackstraws or pick-up sticks. / (dated) An insignificant person.

Resembling a bundle of jackstraws that has been strewn on a surface. / (obsolete, of a person) Of no substance or worth.

Fabric woven on a Jacquard loom. / Fabric resembling a jacquard, but woven by a different process. / (countable) A Jacquard loom.

Too much focus on one's career may lead to one being uninteresting company. / Too much hard work and not enough leisure time can be unhealthy.

A mushroom in genus Suillus, family Boletaceae, especially Suillus luteus; boletes, they have no gills, but release spores from tubes ending in open pores.

The flag of the United Kingdom, consisting of the flags of England (St. George's Cross), Scotland (St. Andrew's Cross), and Ireland (St. Patrick's Cross) now only used in Northern Ireland combined.