0 to adjust something, esp. an engine, so it works as effectively as possible: --
I haven’t tuned my car up in two years.
1 to prepare for a performance or competition, or to adjust an instrument for playing: --
Yards away on the infield, a marching band was tuning up.
NYA ORD
European
May 10, 2021
DAGENS ORD
Shimmer
tune up something