Вы искали: referee (Английский - Суахили)

you be the referee.
kuwa refa.

when the referee blew his whistle for half-time, the players seemed relieved.
mwamuzi alipopiga filimbi kuashiria ni mapumziko, wachezaji wakahisi kupumua.

a few minutes later, after the referee had blown for full time, some simba players collapsed to the ground, not quite believing what they had just pulled off.
dakika chache baadae, baada ya mwamuzi kupiga kipenga kuashiria pambano kuisha, baadhi ya wachezaji wa simba walianguka uwanjani, wasiamini kilichotokea.