first bell; warning bell; (education) the bell alerting students that class will start soon

to ring, to sound, to roar, to chime, to honk

classroom

to begin

teach; to instruct; give a lesson

instruction; teaching; school; lesson, class

a bell, chime / (historical) Synonym of 駅鈴 (ekirei): station bells issued to 駅使 (ekishi) / a large wind bell used as a musical instrument

to return / to go back / to come back

beforehand, in advance

preceding / prior / previous / anticipatory / beforehand / advance / preliminary / provisional / reservation / plan / expectation / forecast / prediction / budget / foreshadowing