noun
one shaku
A traditional Japanese unit of volume, equal to one-tenth of a gō (approximately 18 ml). Used historically for measuring sake and rice.
一勺は一合の十分の一にあたる。
One shaku is one-tenth of a gō.
昔は酒を一勺単位で量っていた。
In the past, sake was measured in units of one shaku.