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giddyap

[gid-ee-ap, -uhp]
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interjection
  1. (used as a command to a horse to speed up).
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Also gid·dap [gi-dap, -duhp] /gɪˈdæp, -ˈdʌp/, gid·dy·up [gid-ee-uhp] /ˌgɪd iˈʌp/.

Origin of giddyap

1920–25, Americanism; informal pronunciation of get up
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018