What is the meaning of set about?

verb

• Begin to deal with.
  • usage: "approach a task"; "go about a difficult problem"; "approach a new project"
  • synonyms: go about, approach
• Enter upon an activity or enterprise.
  • synonyms: undertake, attempt
• 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 out, commence