涂

• Noun: Viscous substance such as mud, mire, or silt; often implies an obstruction or loss of mobility.
• Verb: To smear, coat, plaster, or paint; includes the neutral application of a substance or the act of filling a gap/covering something up.

Primarily used as a transitive verb (smearing X onto Y). In early contexts, it may describe the state of being trapped in mire, where the substance acts upon the subject.

Distinct from general "dirt"; specifically denotes viscous or obstructive material. When a subject is described as being "in" 涂, the primary sense is usually entrapment or impedance.

Appears with both the water radical (涂) and the earth radical (塗). While often interchangeable variants, the water radical may emphasize fluidity and river sediment (silt), whereas the earth radical more strongly suggests thick mud or plaster. Also used as a surname and in the names of specific rivers.

In contexts involving art or craft, note that 涂 focuses on the physical act of "laying on" pigment or lacquer rather than the artistic result.