mug up
verb
mugged up; mugging up; mugs up
intransitive verb
British
: to study intensively (as for an examination)
transitive verb
: to work up by study
Example Sentences
Recent Examples on the Web For the best flavor experience make sure to fill your mug up to the brim, covering all the tiny holes. 
Nishka Dhawan, USA TODAY, 30 Apr. 2021 Anyone who has ever worked in a cannery knows that 'mug up' is a colloquial term for coffee break. Laine Welch, Anchorage Daily News, 29 Apr. 2018
Nishka Dhawan, USA TODAY, 30 Apr. 2021 Anyone who has ever worked in a cannery knows that 'mug up' is a colloquial term for coffee break. Laine Welch, Anchorage Daily News, 29 Apr. 2018 Word History
First Known Use
circa 1860, in the meaning defined at intransitive sense