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English definition of “out-”

out-

prefix uk   /aʊt-/ us  

out- prefix (NOT CENTRAL)

used to add the meaning 'not central' to nouns and adjectives: the outskirts of town (= the areas that form the edge of the town)

out- prefix (FURTHER)

used to add the meaning 'going further' or 'being better than' to verbs: She doesn't drink or smoke and I'm sure she'll outlive (= live longer than) us all.

out- prefix (AWAY FROM)

used to add the meaning 'out of' or 'away from' to nouns and adjectives: She turned away from their outstretched hands (= hands held out).
(Definition of out- prefix from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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