Translation of "trille" into English

Vi øver lige en trille.

We're just learning some runs.

Jeg lover at hvis de gik over stregen, vil der trille hoveder.

I promise you, if they were out of line, heads will roll.

Når hun nærmer sig lydkilden, begynder hannen at synge en vedvarende trille, parringssangen.

As she approaches the source of the chirping, the male cricket will begin to sing a continuous trill, the courtship song.