a process that gradually increases or decreases in a circular manner

सर्पिल प्रक्रिया

English Usage: The company's profits began to spiral downward after the market crash.

Hindi Usage: बाजार के दुर्घटना के बाद कंपनी के फायदे सर्पिल नीचे की ओर बढ़ने लगे।