com/defusion , it is a term in psychoanalysis and means: separation of the life instinct from the death instinct, a process often accompanying maturity In other words, when one is young one's "life instinct" and "death instinct" are supposed to be fused, and as one matures they are supposed to separate. A lot of psychoanalysis is mumbo-jumbo, so this may be also.
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cho7712So this is rarely used in everyday use of English.No, it is a very specialised word (in this sense) and most people would not know it.
dave_anonAs GPY says, it also has a specialised meaning in psychotherapy - particularly in ACT (Acceptance and Commitment Therapy)If you you used to be bullied in the park then, even when you are much older, you may not feel happy walking in the park. But it is possible to separate the two things: 'I can walk in the park and not be bullied'. That means that you have taken