What is the meaning of casing?

noun

• The housing or outer covering of something.
  • usage: "the clock has a walnut case"
  • synonyms: shell, case
• The outermost covering of a pneumatic tire.
• The enclosing frame around a door or window opening.
  • usage: "the casings had rotted away and had to be replaced"
  • synonyms: case

verb

• Look over, usually with the intention to rob.
  • usage: "They men cased the housed"
  • synonyms: case
• Enclose in, or as if in, a case.
  • usage: "my feet were encased in mud"
  • synonyms: encase, incase, case