<prompt> One of the impoant defence mechanism isAlienationConfabulationRepressionSuppression  <response>: Repression is a primary defence mechanism and is defined as unconsciously excluding from conscious awareness of anxiety-provoking ideas and or feelings. eg in normal life: forgetting and slips of the tongue Ref: a sho textbook of psychiatry, Niraj Ahuja,7th edition, pg no 207 