do one /ˌdoʊ ˈwʌn/number 1verb 1forms 4 number1 •The cardinal number occurring after do and before do two in a duodecimal system. Written 11, decimal value 13. verb1 •(UK, informal) To go away, to leave; to get lost.I am a northerner and if any daft apeth with a cob on wants to mither me about my accent, they can do one. — 2019 formsdid one · done one · doing one · does one