• 機械きかい — machine, machinery
• 器械きかい — apparatus, equipment
• 手械てかせ — handcuffs
• 械具かいぐ — mechanical tool
• 装置そうち — device, installation (not with this kanji but related contextually)

形声文字 combining the radical 木 (tree/wood) with the phonetic element 戒 (warn, command). Originally associated with crafted wooden tools or instruments, it evolved to refer more broadly to mechanical devices. It’s often used in technology-related vocabulary.

機械きかいが 故障こしょうしました。
The machine broke down.

最新さいしんの器械きかいを導入どうにゅうした。
We installed the latest equipment.

手械てかせを使つかうのは 最後さいごの手段しゅだんです。
Using handcuffs is a last resort.

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