change up phrasal verb

1. (British English) to start using a higher gear when driving a car, etc.
   • ● Change up into fifth.
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[TahlilGaran] English Dictionary ▲

change up
To pitch a ball at less than full speed in baseball. - Usually used with "on".
John pitched a ball that was very fast and the batter missed it. Then he let up on the next pitch and the batter was badly fooled.

See: LET UP(4).

[TahlilGaran] English Idioms Dictionary ▲