noun
karate
The Japanese martial art and sport known as karate. Used as a noun in expressions such as 空手を習う, 空手の試合, and 空手の黒帯.
息子は週に二回、空手を習っている。
My son is learning karate twice a week.
彼女は空手の黒帯だ。
She is a black belt in karate.
noun
empty-handed; having nothing in one's hands
Only when written 空手
Literal use of 空手 meaning having nothing in one's hands or bringing nothing. In everyday conversation, 手ぶら is often the more common way to say this.
招かれた家に空手で行くのは失礼だと思った。
I felt it would be rude to go to the house I had been invited to empty-handed.