Douglas Harper's Etymology Dictionary
Wiktionary
hang up
vb. 1 (context transitive English) To put up to hang 2 (context intransitive idiomatic English) To terminate a telephone call 3 to keep delayed, suspended, held up, or stuck
WordNet
hang up
v. put a telephone receiver back in its cradle
cause to be hanging or suspended; "Hang that picture on the wall" [syn: hang]
interrupt a telephone conversation
Usage examples of "hang up".
Grimes, at her invitation, removed his cloak and cap, gave them to her to hang up somewhere with her own gown, sat down on a well-sprung divan.
She was about to hang up out of pure indecision, and I needed the job.
She was so excited then she could scarcely control her shaking fingers enough to hang up the rest.