jacket — ODE · Shobdo

jacket /ˈdʒakɪt

▸ noun

1 an outer garment extending either to the waist or the hips, typically having sleeves and a fastening down the front:

she chose to wear a blue jacket with white stripes

[as modifier] he put his hand in his jacket pocket.

2 an outer covering, especially one placed round a tank or pipe to insulate it.

▪ the dust jacket of a book.

▪ a record sleeve.

3 the skin of a potato:

potatoes cooked in their jackets.

▪ British English informal a jacket potato.

4 US English a folder or envelope containing an official document or file.

5 a steel frame fixed to the seabed, forming the support structure of an oil production platform.

▸ verb

( jackets, jacketing, jacketed)

[with object] cover with a jacket.

– ORIGIN late Middle English: from Old French jaquet, diminutive of jaque (see jack2).