糸口・緒・絲口|いとぐちitoguchi[2]nakadaka (mid-high)

1. nounbeginning; start; first step
   とても魅力的みりょくてきな人ひとに初はじめて会あって、話はなしの糸口いとぐちを見みつけるのは、たいていかなり難むずかしいものだ。↗

   People usually find it very difficult to break the ice when they meet someone extremely attractive for the first time.
2. nounclue; lead; hint
   わずかなヒントを糸口いとぐちにして、正ただしいこたえを見みつけた。↗

   He took a slight hint as the start and found the correct answer.
3. nounthread end

• Synonym端緒たんしょWrittenWritten/formal prose. Covers both the start of something and clues, as in 「端緒を開く」; 糸口 leans toward leads for solving a problem.
• SynonymきっかけCasualColloquial. The trigger or occasion that gets something started, as in 「〜をきっかけに」; 糸口 is about leads for working out a problem.
• Synonym発端ほったんWrittenWritten/formal prose. The opening of an event or dispute; 糸口 points to leads for finding a solution.
• Synonym幕開けまくあけNeutralNeutral. Raising the curtain on something, such as the start of a new era; 糸口 is about leads for solving a problem.
• Synonym起点きてんNeutralNeutral. A starting point or point of departure; 糸口 is a lead you have found toward a solution.
• Synonym初手しょてNeutralNeutral. The first move in shogi or go, or the very beginning of something; 糸口 is about leads for solving a problem.
• Synonym濫觴らんしょうWrittenWritten/formal prose. The very beginning of something; 糸口 is about leads for solving a problem.
• Synonym起首きしゅWrittenWritten/formal prose. The point in time when something begins; 糸口 is about leads and clues.
• Related発祥はっしょうWrittenWritten/formal prose. Where something cultural first arose; 糸口 is about leads toward a solution.
• Related源流げんりゅうWrittenWritten/formal prose. The source of a river or of a culture; 糸口 is about leads and clues.
• Related芽生えめばえNeutralNeutral. A bud, or the first stirring of new feelings, as in 「恋の芽生え」; 糸口 is about leads.
• RelatedルーツCasualColloquial loanword. Roots or origins, such as a person's background; 糸口 is about leads for solving a problem.
• Related手がかりてがかりNeutralNeutral. A clue for solving a problem, and also a physical handhold; 糸口 leans toward leads and beginnings.
• Related足がかりあしがかりNeutralNeutral. A foothold or stepping stone, as in 「足がかりを築く」; 糸口 is about leads.
• Related鍵かぎNeutralNeutral. A key, literal or figurative — the crucial point; 糸口 is a lead you have just found.
• RelatedキーCasualColloquial loanword. The key point or crucial factor; 糸口 is about leads and clues.
• RelatedオリジンCasualColloquial loanword. Where something originated, its source; 糸口 is about leads for solving a problem.
• Related元始げんしFormalFormal. The primal origin of things; 糸口 is about leads and clues.
• Related淵源えんげんWrittenWritten/formal prose. Deep, distant origins; 糸口 is the lead close at hand.
• Related手蔓てづるNeutralNeutral. Connections or contacts you can rely on; 糸口 is about leads in the matter itself.
• Antonym結NeutralNeutral. The end or settlement of a matter — the opposite end from 糸口, which marks the beginning.

Use 「糸口」 for a lead or clue toward solving a problem, as in 「解決の糸口」 or 「話の糸口」. For the trigger that starts something, pick 「きっかけ」; for a clue or trail, 「手がかり」; for a foothold, 「足がかり」; for the crucial point, 「鍵」; for the opening of an event, 「発端」. Most of the others name origins or beginnings and belong to written prose.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. いとぐちのこと。