Etymology
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hang up (v.)

c. 1300, "suspend (something) so that it is supported only from above;" see hang (v.) + up (adv.); telephone sense by 1911. The noun hang-up "psychological fixation" is first attested 1959, from notion of being suspended in one place.

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Definitions of hang up

hang up (v.)
put a telephone receiver back in its cradle;
hang up (v.)
cause to be hanging or suspended;
Synonyms: hang
hang up (v.)
interrupt a telephone conversation;
From wordnet.princeton.edu