This is the 1255th most frequent Japanese word.
切れ
"切れ" means "sharpness," "cutting edge," or "a piece/slice," depending on context.
In this sentence, '切れ' refers to the sharpness of the knife, describing its effectiveness in cutting.
ナイフの切れが良いので、簡単に切れました。
The knife's sharpness is good, so it cut easily.
Here, '切れ' figuratively describes the sharpness or acuity of the person's words or arguments.
彼の言葉の切れが鋭いので、議論でいつも勝つ。
His words are sharp, so he always wins in debates.
In this context, '切れ' is used to denote the sharp condition or cutting ability of the machine's parts.