杵

A heavy handheld tool used for vertical pounding, typically appearing in two domestic contexts:

1. Processing: A pestle used in a mortar (臼) for crushing grain, herbs, or medicines (pulverization).

2. Cleaning: A baton or beater used to pound fabric against a stone or board to remove dirt (agitation).

Primarily a noun. It may function as a verb meaning "to pound," "to crush," or "to beat," with the specific nuance determined by the object being acted upon (e.g., food/medicine vs. textile).

• Motion: Implies a vertical, plunging motion. This distinguishes it from 捶 (chuí), which typically implies a swinging or striking motion associated with hammers or combat.
• Materiality: While the stone radical (石) is present, it denotes the tool's weight and function; the object may be constructed from hardwood.

Frequently appears in tandem with 臼 (jiù, mortar). When encountered as a pair (杵臼), the term may refer literally to the tools or figuratively to the rhythmic drudgery of domestic labor or the process of refinement through pressure.