What is the meaning of chap?

noun

• A boy or man.
  • usage: "that chap is your host"; "there's a fellow at the door"; "he's a likable cuss"; "he's a good bloke"
  • synonyms: fellow, feller, fella, lad, gent, blighter, cuss, bloke
• A long narrow depression in a surface.
  • synonyms: crevice, cranny, crack, fissure
• A crack in a lip caused usually by cold.
• Usually in the plural. ( leather leggings without a seat; joined by a belt; often have flared outer flaps; worn over trousers by cowboys to protect their legs)

verb

• Crack due to dehydration.
  • usage: "My lips chap in this dry weather"