• 開始かいし — start, commencement
• 始業しぎょう — beginning of work/school
• 原始げんし — primitive, origin
• 終始しゅうし — from beginning to end; consistently
• 始動しどう — starting (a machine, engine, etc.)
• 始末しまつ — disposal / management

The character combines 女 (woman) and 台 (platform/origin shape) to form the phonetic and semantic compound. It conveys the idea of “starting” or “originating” from something.

クラスは九時くじに始はじまります。
The class begins at 9 o'clock.

新あたらしい仕事しごとを始はじめました。
I started a new job.