Medical Definition of externalize
ex·ter·nal·ized or British ex·ter·nal·isedex·ter·nal·iz·ing or British ex·ter·nal·is·ing
1a: to transform from a mental image into an apparently real object (as in hallucinations) : attribute (a mental image) to external causation <externalizing an obsession>b: to invent an explanation for (an inner problem whose actual basis is known only subconsciously) by attributing to causes outside the self : rationalize, project <externalized his failure>
2: to direct outward socially <externalized her anger>
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