To provoke discussion or stir things up; to introduce an idea or action that causes a reaction or raises questions (idiomatic).
彼の論文は業界に一石を投じる内容で、多くの反響を呼んだ。
His paper provoked the industry and drew a lot of response.
新しい税制案は議会で一石を投じ、長い議論を引き起こした。
The new tax proposal stirred debate in parliament and triggered long discussions.
その提案は既成概念に一石を投じるもので、多くの人の注目を集めた。
The proposal challenged established ideas and attracted a lot of attention.