verb (v)

• take watchful responsibility for(verb.social)

  Example:
  I baby-sit the neighbor's plants when she is out of town.
  

  source: wordnet30
• work or act as a baby-sitter(verb.social)

  Example:
  I cannot baby-sit tonight; I have too much homework to do.
  

  Synonym:
  sit
  

  source: wordnet30