Definitions of expand:

• verb:   extend in one or more directions

  Example: "The dough expands"

• verb:   become larger in size or volume or quantity

  Example: "His business expanded rapidly"

• verb:   make bigger or wider in size, volume, or quantity

  Example: "Expand the house by adding another wing"

• verb:   expand the influence of
• verb:   exaggerate or make bigger
• verb:   grow stronger
• verb:   add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing