改修（かいしゅう、kaishuu）
- renovation

The Japanese word 改修 (かいしゅう) primarily means "renovation," "repair," "remodeling," or "improvement." It refers to the act of restoring something to a better condition, upgrading it, or making changes to improve its functionality, appearance, or lifespan. This word is often used in contexts related to buildings, infrastructure, and even software. It implies a significant level of change or restoration, rather than just minor maintenance. It is a compound word: 改 (kai) means "to change, improve, correct," and 修 (shū) means "to repair, mend, revise." Combining these two characters gives the nuance of improving by repairing or changing.

⚫︎ 家の改修工事 Translation: House renovation work ⚫︎ 老朽化した橋の改修 Translation: Renovation of an aging bridge ⚫︎ システムの改修を行う Translation: To carry out system renovation/upgrades

⚫︎ You would use 改修 when discussing projects that involve fixing, improving, or updating something that has fallen into disrepair or needs to be brought up to a better standard. ⚫︎ It’s suitable for professional contexts (e.g., construction, engineering, IT) and also for more general conversations about home improvements or infrastructure projects. ⚫︎ It is typically used to describe larger-scale projects rather than simple fixes.

⚫︎ The word 改修 is written using kanji: 改修. ⚫︎ The reading is かいしゅう in hiragana. ⚫︎ There are no common variations in the okurigana.

⚫︎ 修理 (しゅうり) - repair (generally for smaller items) ⚫︎ 改築 (かいちく) - rebuilding, reconstruction ⚫︎ 修繕 (しゅうぜん) - repair, maintenance (often for smaller-scale tasks) ⚫︎ リフォーム (rifōmu) - reform, remodeling (borrowed from English, often used for homes) ⚫︎ 改編 (かいへん) - reorganization; restructuring (used in fields such as broadcasting and management)

⚫︎ While there isn't a single direct antonym, words that imply destruction or demolition could be considered opposites in a broad sense. ⚫︎ 破壊 (はかい) - destruction ⚫︎ 解体 (かいたい) - demolition

古いアパートを改修して、新しい賃貸物件に生まれ変わらせた。 ・Translation: They renovated the old apartment and transformed it into a new rental property. ・Explanation: This sentence describes a complete improvement of an old building through renovation.

このソフトウェアはバグを修正し、パフォーマンスを向上させるために改修が必要です。 ・Translation: This software needs [改修] (renovation) to fix bugs and improve performance. ・Explanation: This sentence demonstrates 改修 usage in the software development context.

The word 改修 is a combination of two kanji characters, each with a specific meaning: 改, which implies "changing" or "improving," and 修, which conveys "repairing" or "mending." The compound word thus reflects the idea of improving something through the process of repairing and altering it. The use of kanji also highlights the word's association with more formal or technical contexts, as opposed to simple words like "fix."