Definition of mug-up in English:

mug-up

noun

Canadian
Nautical
informal
  • A snack, a meal; a hot drink accompanied by food.

Origin

Early 20th century; earliest use found in Scribner's Magazine. From to mug up.

Pronunciation

mug-up

/ˈmʌɡʌp//mʌɡˈʌp/