"casing" in the noun sense
1. shell, case, casing
the housing or outer covering of something
"the clock has a walnut case"
the outermost covering of a pneumatic tire
3. casing, case
the enclosing frame around a door or window opening
"the casings had rotted away and had to be replaced"
"casing" in the verb sense
look over, usually with the intention to rob
"They men cased the housed"
2. encase, incase, case
enclose in, or as if in, a case
"my feet were encased in mud"
Source: WordNet® (An amazing lexical database of English)
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