tune up (something)

to adjust an engine or vehicle so that it works as well as possible.

I haven't tuned up my car in two years.

The motorcycle isn't running right, but she can't afford to tune it up.

• on the side
• on the sidelines
• on the side of the angels
• on the sly
• on-the-spot
• on the spot
• on the spur of the moment
• on the starting blocks
• on the strength of
• on the strength of something
• on the stump
• on the table
• on the threshold of
• on the threshold of something
• on the tip of tongue
• on the tip of your tongue
• on the town
• on the trot
• on the verge of
• on the verge of doing something
• on the wagon
• on the warpath
• on the way
• on the whole
• on the wing