プログレッシブ和英中辞典(第4版)の解説
いとぐち【糸口】
&fRoman1;〔巻いた糸の端〕the end of a thread
&fRoman2;
❶〔発端〕
それが出世の糸口となった
That was 「his first step to [the beginning of his] success in life.
❷〔手掛かり〕a lead; a clue
警察は彼の住所録から事件解明の貴重な糸口を得た
His address book provided the police with several valuable leads to help solve the case.
彼の所在を明らかにする糸口は何もない
We don't have a single clue to his whereabouts.