Definitions of shop:

• noun:   a mercantile establishment for the retail sale of goods or services

  Example: "He bought it at a shop on Cape Cod"

• noun:   a course of instruction in a trade (as carpentry or electricity)

  Example: "I built a birdhouse in shop"

• noun:   small workplace where handcrafts or manufacturing are done
• verb:   do one's shopping

  Example: "She goes shopping every Friday"

• verb:   shop around; not necessarily buying
• verb:   do one's shopping at; do business with; be a customer or client of
• verb:   give away information about somebody