Allegro – Quick (literally 'cheerful')
The athlete had a leg grow (allegro) and cheerfully ran quickly to win the race.
Examples of allegro in a sentence
She was quite new to the flute and could barely keep up when the orchestra got to the allegro section of the piece.
The kettle drummer loved playing allegro parts when he could put some real pace and occasional thunder into the music.
Allegro was hardly the word for the orchestra's finale - the speed at which they played it was breathtaking.