1. ditch
2. gutter
3. groove
4. gully
5. ravine

classifier: 道

1. (bound form) way; reason; principle
2. (bound form) a skill; an art; a specialization
3. (Daoism) the Way; the Dao
4. to say (introducing a direct quotation, as in a novel)
5. (bound form) to express; to extend (polite words)
6. classifier for long thin things (rivers, cracks, shadows etc), barriers (walls, doors etc), questions (in an exam etc), commands, courses in a meal, steps in a process
7. (old) circuit (administrative division)

classifiers: 條, 股