An injury or wound to the body (cuts, bruises, wounds, etc.).
自転車で転んで膝に大きなけがをした。
I fell off my bike and got a bad injury on my knee.
けがの手当てをしてから病院に連れて行った。
I treated the wound first and then took (them) to the hospital.
試合中、相手選手にぶつかって顔にけがを負った。
During the match, I collided with an opponent and suffered a facial injury.
Figuratively, a mistake, accident, or loss — harm or damage caused by an error or mishap.
あの誤植が原因で会社に大きなけがが出た。
That typo caused considerable loss to the company.
試験直前の風邪で受験にけがをした学生が何人かいた。
A few students were harmed (suffered a setback) in their exams by catching a cold just before the test.