Definitions of stub:

• noun:   the part of a check that is retained as a record
• noun:   a torn part of a ticket returned to the holder as a receipt
• noun:   a short piece remaining on a trunk or stem where a branch is lost
• noun:   the small unused part of something (especially the end of a cigarette that is left after smoking)
• noun:   a small piece

  Example: "A stub of a pencil"

• verb:   strike against an object

  Example: "She stubbed her one's toe in the dark and now it's broken"