重機（じゅうき、juuki）
- heavy machinery

The Japanese word 重機 (じゅうき) refers to "heavy machinery" or "construction equipment." It encompasses a wide variety of large, powerful machines used in construction, demolition, mining, forestry, and other industrial activities. These machines are generally designed for heavy-duty tasks that would be difficult or impossible to accomplish manually.

⚫︎その工事現場には多くの 重機 がありました。 Translation: There were many pieces of heavy machinery at the construction site. ⚫︎ 重機 のオペレーターは高い技術が求められます。 Translation: Operators of heavy machinery require a high level of skill. ⚫︎地震の後、がれきの撤去に 重機 が使われました。 Translation: Heavy machinery was used to remove debris after the earthquake.

This word is used in formal and informal contexts. You would use 重機 when discussing construction projects, infrastructure development, or any situation where these large machines are involved. It's a common term, easily understood by most people in Japan.

⚫︎The word is primarily written in kanji: 重機. ⚫︎The reading is じゅうき (juuki) in hiragana. ⚫︎There is no variation in the okurigana.

⚫︎建設機械 (kensetsu kikai): Construction machinery ⚫︎土木機械 (doboku kikai): Civil engineering machinery (slightly more specific to infrastructure projects)

There aren't direct antonyms, as 重機 describes a type of equipment. However, you could consider "small tools" or "hand tools" as contrasting elements, but they are not antonyms.

新しい道路を作るために、たくさんの 重機 が動いています。 ・Translation: Many pieces of heavy machinery are operating to build a new road. ・Explanation: This sentence describes the use of heavy machinery in a road construction project.

この 重機 は、山から石を運ぶために使われています。 ・Translation: This heavy machinery is used to transport stones from the mountains. ・Explanation: This sentence explains the specific purpose of the heavy machinery.

The word 重機 is composed of two kanji: 重 (jū), meaning "heavy" or "weight," and 機 (ki), meaning "machine" or "mechanism." Therefore, 重機 literally means "heavy machine." This combination accurately reflects the nature of the equipment it describes.