• 機械きかい — machine
• 機会きかい — opportunity
• 飛行機ひこうき — airplane
• 機能きのう — function
• 危機きき — crisis

The left side “きへん” (木) suggests wood, originally for a wooden loom. The right component (幾) adds the sound and also relates to intricate mechanisms. Together, it refers to a weaving machine — later expanding to general machines and symbolic “opportunities.”

新あたらしい 機械きかいを 導入どうにゅうしました。
We introduced a new machine.

彼かれには 成功せいこうの 機会きかいがありました。
He had a chance for success.

The on-yomi キ is used in almost all common compounds. The kun-yomi はた (loom) is rarely used in modern Japanese but reveals the character’s origin.