to start working seriously
真剣に働き始める (shinken ni hataraki hajimeru)
"If you want to pass the exam, you’d better buckle down and study."
"試験に合格したいなら、buckle downして勉強を始めたほうがいい。" (Shiken ni gōkaku shitai nara, buckle down shite benkyō o hajimeta hō ga ii.)
to admit your mistake and apologize
when performers return to the stage to receive applause
to increase speed
to help someone with a task
to be full of great joy or excitement
to make something more interesting or lively
