English

Definition of giddy-up exclamation from the Oxford Advanced Learner's Dictionary

 

giddy-up

 exclamation
exclamation
BrE BrE//ˌɡɪdi ˈʌp//
 
; NAmE NAmE//ˌɡɪdi ˈʌp//
 
 
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used as a command to a horse to make it go faster Word Origin1920s (originally US as giddap): reproducing a pronunciation of get up.
See the Oxford Advanced American Dictionary entry: giddy-up