• 干物ひもの — dried food (esp. fish)
• 干潮かんちょう — low tide
• 干ほす — to dry / to air
• 若干じゃっかん — a few / some
• 干渉かんしょう — interference / intervention
• 干支えと — zodiac signs (Chinese cycle)
• 干満かんまん — ebb and flow (tides)
• 日干ひぼし — sun drying / airing in the sun

干 originally depicted a pole or shield. Over time, it came to mean “to dry” by exposure, and also “to interfere” or “involve.” Its uses extend from physical drying to figurative intervention.

洗濯物せんたくものを 干ほしてきました。
I just hung the laundry out to dry.

政治せいじに 干渉かんしょうすべきではない。
You shouldn’t interfere in politics.