noun
physical labor; manual work; heavy work
Only when written 荒業
Refers to demanding physical tasks, often involving strength or endurance. The kanji 荒業 is typical for this meaning.
建設現場では毎日荒業が続く。
At the construction site, heavy physical labor continues every day.
引っ越しの手伝いはかなりの荒業だった。
Helping with the move was quite a physical task.
noun
drastic move; power technique; display of power
Used in martial arts or competitive contexts for a bold, forceful technique or maneuver. The spelling 荒技 is common here, but 荒業 also appears.
彼は試合で見事な荒技を決めた。
He executed a brilliant power technique in the match.
そのレスラーは荒業で相手を投げ飛ばした。
The wrestler threw his opponent with a drastic move.
力業 also means a feat of strength or brute-force technique, but is more general and less associated with martial arts than 荒技.
Compound of 荒 (rough, wild) and 業 or 技 (work, technique). The exact historical derivation is uncertain, but the word has been used for both heavy labor and forceful techniques.