There are 2 definitions of ow in English:

ow1

Line breaks: ow

exclamation

Used to express sudden pain: Ow! You’re hurting me!
More example sentences
  • ‘OW! Let me go!’ you tell him. He doesn't listen to you.
  • Kevin gasped as the pain once again shot through his back, ‘Ow!’

Origin

natural exclamation: first recorded in English in the mid 19th century.

Definition of ow in:

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Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous