開始
かいし · kaishi · JLPT N3 · noun
start
🏁 開始 = open (開) + begin (始): you open something to begin it
開 means open, as in 開く (hiraku, to open). 始 means begin, as in 始める (hajimeru, to start). Together they mean the official start of something, like 試合開始 (start of the match). Mnemonic sound hook: kaishi, the kick-off of a show.