What is the meaning of lumber?

noun

• The wood of trees cut and prepared for use as building material.
  • synonyms: timber
• An implement used in baseball by the batter.
  • synonyms: baseball bat

verb

• Move heavily or clumsily.
  • usage: "The heavy man lumbered across the room"
  • synonyms: pound
• Cut lumber, as in woods and forests.
  • synonyms: log