also: たんちょ
start; beginning; clue; first step
Refers to the very beginning or a hint that leads to understanding something; often used in formal or written contexts.
We found a clue to solving the case.
The beginning of the research started from a small question.
The police found the first lead toward solving the case.
That discovery became the starting point for new research.
This treaty opened the way toward improved relations between the two countries.