What is the meaning of call in?

verb

• Summon to enter.
  • usage: "The nurse called in the next patient"
• Summon to a particular activity or employment.
  • usage: "Experts were called in"
• Pay a brief visit.
  • usage: "The mayor likes to call on some of the prominent citizens"
  • synonyms: visit, call
• Take a player out of a game in order to exchange for another player.
• Make a phone call.
  • usage: "call in to a radio station"; "call in sick"
• Demand payment of (a loan. )
  • usage: "Call a loan"
  • synonyms: call
• Cause to be returned.
  • usage: "recall the defective auto tires"; "The manufacturer tried to call back the spoilt yoghurt"
  • synonyms: recall, call back, withdraw