noun
collar points; tip of a collar
Refers to the pointed ends of a shirt or jacket collar.
ワイシャツの襟先が汚れている。
The collar points of the dress shirt are dirty.
襟先をきちんと折る。
Fold the collar tips neatly.
Mixed kana-kanji spelling; seen in informal writing.
襟 is the general word for 'collar'; 襟先 specifically means the pointed tips.
Compound of 襟 (えり, 'collar') + 先 (さき, 'tip, point').