odd idea; unusual proposal
Refers to a suggestion or plan that is peculiar, unconventional, or surprisingly creative. Often carries a slightly humorous or skeptical tone.
He always comes up with odd ideas at meetings.
That unusual proposal was not adopted in the end.
Compound of 珍 (ちん, 'rare, unusual') and 案 (あん, 'idea, proposal'). The exact historical derivation is uncertain, but the word follows a common Sino-Japanese compounding pattern.