- To derange is defined as to unsettle something or to make insane.
- An example of to derange is to change the pattern of a child’s day.
- An example of to derange is to drive someone crazy.
transitive verbde·ranged, de·rang·ing, de·rang·es
- To disturb the order, arrangement, or functioning of: an asteroid impact large enough to derange the climate.
- To upset (normal condition or functioning, as of a bodily organ).
- To cause to be psychotic or otherwise severely mentally unsound.
Origin of derangeFrench déranger, from Old French desrengier : des-, de- + reng, line (of Germanic origin; see sker-2 in Indo-European roots).
(third-person singular simple present deranges, present participle deranging, simple past and past participle deranged)