What does 一筋 mean in Japanese?

one line, one stretch (e.g. of road), one strand (e.g. of hair), one beam (e.g. of light), one ray, one length (e.g. of rope)

一筋 (Hitosuji) — one line · Japanese Dictionary

ひとすじ

Hitosuji

Other forms: 一条、ひと筋、一すじ、ひと条

一筋 (Hitosuji) is a Japanese noun meaning “one line, one stretch (e.g. of road), one strand (e.g. of hair), one beam (e.g. of light)”.

nounone line; one stretch (e.g. of road); one strand (e.g. of hair); one beam (e.g. of light); one ray; one length (e.g. of rope)
na-adjective, noun suffixearnest; resolute; intent; devoted; single-minded
nounone bloodline; one clan
na-adjectiveordinary; common

Sentences from Tatoeba (CC BY 2.0 FR).