noun
one line; one strand; one beam
Counts a single long, thin thing: a line, strand of hair, beam of light, stretch of road, or length of rope. Used with the counter 筋.
彼女の髪に白いものが一筋混じっている。
There is a single strand of white mixed into her hair.
雲の切れ間から一筋の光
A single beam of light shone through a break in the clouds.
na-adjective, noun, used as a suffix
earnest; single-minded; devoted
Describes a person who is focused on one path or goal with unwavering dedication. Often used as 一筋な or 一筋の.
彼は研究一筋の人生を送ってきた。
He has lived a life devoted solely to research.
彼女の一筋な性格が周囲の信頼を集めている。
Her single-minded character earns the trust of those around her.
noun
one bloodline; one clan
Archaic noun meaning a single family line or clan. Not used in modern Japanese outside historical contexts.
古文書には、一筋の家系が代々その地を治めたと記されている。
Ancient documents record that a single family line ruled that land for generations.
na-adjective
Archaic adjectival noun meaning ordinary or common. Replaced by words like 普通 or 平凡 in modern usage.
江戸時代の文献では、一筋な町人という表現が見られる。
In Edo-period documents, the expression 'ordinary townspeople' can be found.