adv

• (comparable) From a higher position to a lower one; downwards.
  "The cat jumped down from the table."
• (comparable) At a lower or further place or position along a set path.
  "His place is farther down the road."
• (rail transport) In the direction leading away from the principal terminus, away from milepost zero.
• (UK, academia, dated) Away from Oxford or Cambridge.
  "He's gone back down to Newcastle for Christmas."

prep

• (colloquial) At (a given place that is seen as removed from one's present location or other point of reference).
  "I'll see you later down the pub."

adj

• (informal) Sad, unhappy, depressed, feeling low.
  "Mary seems very down since she split up with her boyfriend."
• Sick, wounded, or damaged:
  "He is down with the flu."
• Sick, wounded, or damaged:
  "We have an officer down outside the suspect's house."
• Sick, wounded, or damaged:
  "a down cow"

verb

• (transitive) To knock (someone or something) down; to cause to come down; to fell.
  "The storm downed several old trees along the highway."
• (transitive) To knock (someone or something) down; to cause to come down; to fell.
  "The helicopter was downed by a surface-to-air missile."
• (transitive) To lower; to put (something) down.
  "The bell rang for lunch, and the workers downed their tools."
• (transitive, figurative) To defeat; to overpower.
  "To down proud hearts that would not willing die."