jacket

B2 · Upper Intermediate Countable noun

n. a protective outer cover for something, like a book or a water tank.

n. an outer covering or casing used for protection, insulation, or identification.

“The book jacket was beautifully designed with bright colors and gold letters.”

“The technician replaced the insulation jacket on the boiler to improve the building's overall energy efficiency.”

B1 · Intermediate Countable noun Cooking British English

n. the skin of a potato, especially when it is baked.

n. the skin of a potato, particularly when left on during the cooking process.

“I usually eat the jacket of the potato because it contains many vitamins.”

“The chef served the sea bass alongside a crispy jacket potato seasoned with sea salt and rosemary.”

C1 · Advanced Countable noun Slang · American English

n. a person's official criminal record or police file.

n. a person's official criminal history or police file, often used in law enforcement contexts.

“The officer checked the suspect's jacket to see if he had any previous arrests.”

“Despite his clean appearance, a quick look at his jacket revealed a history of minor drug offenses and parole violations.”

C2 · Proficiency Technical

v. to put a cover or a jacket around something.

v. to enclose or encase an object in a protective or insulating covering.

“The workers had to jacket the pipes to prevent them from freezing in the winter.”

“Engineers decided to jacket the structural steel columns with fire-resistant material to meet the new safety regulations.”