noun
speculative spirit; gambling instinct
Refers to a person's inclination toward speculation, risk-taking, or gambling, often in financial or adventurous contexts.
彼は山っ気が強くて、株に手を出した。
He has a strong speculative streak and got into stocks.
山っ気のある人は、ギャンブルにハマりやすい。
People with a gambling instinct tend to get hooked on gambling.