/ dɪsˈmæntl; NAmE / verb [ vn ]
1.
to take apart a machine or structure so that it is in separate pieces :
I had to dismantle the engine in order to repair it.
The steel mill was dismantled piece by piece.
2.
to end an organization or system gradually in an organized way :
The government was in the process of dismantling the state-owned industries.
► dis·mant·ling noun [ U ]
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WORD ORIGIN
late 16th cent. (in the sense destroy the defensive capability of a fortification ): from Old French desmanteler , from des- (expressing reversal) + manteler fortify (from Latin mantellum cloak).