Blade Edge
Noun
はさき
刃先を俺の首に当てながら、奴は、皆にいつもご機嫌をとられてるってのはどんな気分なのかと聞いてきたんだ。
While putting the edge of the blade in my neck, the guys asked me what it’s like to have people fawning over me all the time.
The blade's ahead is the farthest part of the blade away from you (since it's ahead of you). This is the edge of the blade or blade edge.
The reading is the kun'yomi readings of the kanji. For 刃 you learned that with the kanji. For 先 that's the vocab version of the kanji.