The term 'fast movement' can refer to a variety of things, including musical pieces and political protests. The crossword solutions for this term are Scherzo (7 letters), ALLEGRO (7 letters), PRESTO (6 letters), and Hungerstrike (12 letters). Scherzo is a type of musical composition that is usually fast-paced and lighthearted. ALLEGRO is a musical tempo that is faster than moderate but slower than PRESTO. PRESTO is a very fast tempo in music. Finally, hungerstrike is a form of protest in which participants refuse to eat in order to draw attention to their cause.