buff up
verb1
Idiomatic To improve.
- […] Mr. Kurz was quickly seen in Europe as the poster boy of an ascendant right for a new generation, a political Wunderkind who had salvaged conservatism by borrowing the far right’s agenda, buffing it up and bringing it into the mainstream.2021 October 17, Katrin Bennhold, “Fake Polls and Tabloid Coverage on Demand: The Dark Side of Sebastian Kurz”, in The New York Times, →ISSN:
2
To shine; to make shiny.
3
Idiomatic To become more muscular.
4
Idiomatic To study hard to learn a particular subject.
- I'll need to buff up on my Italian before my trip to Genoa.