What is the meaning of set out?

verb

• Take the first step or steps in carrying out an action.
  • usage: "We began working at dawn"; "Who will start"; "Get working as soon as the sun rises"; "The first tourists began to arrive in Cambodia"; "He began early in the day"; "Let's get down to work now"
  • synonyms: get down, begin, get, start out, start, set about, commence
• Lay out orderly or logically in a line or as if in a line.
  • usage: "lay out the clothes"; "lay out the arguments"
  • synonyms: range, array, lay out
• Leave.
  • usage: "The family took off for Florida"
  • synonyms: depart, part, start, start out, set forth, set off, take off