1. insane.
  2. disordered; disarranged.

verb (used with object), de·ranged, de·rang·ing.

  1. to throw into disorder; disarrange.
  2. to disturb the condition, action, or function of.
  3. to make insane.

verb (tr)

  1. to disturb the order or arrangement of; throw into disorder; disarrange
  2. to disturb the action or operation of
  3. to make insane; drive mad

c.1790, “insane;” of things, “out of order,” from 1796; past participle adjective from derange (v.).


1776, “throw into confusion,” from French déranger, from Old French desrengier “disarrange, throw into disorder,” from des- “do the opposite of” (see dis-) + Old French rengier (Modern French ranger) “to put into line,” from reng “line, row,” from a Germanic source (see rank (n.)). Mental sense first recorded c.1790.

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