| oar | remo = paddle |
| oath | juramento / to swear an oath = prestar juramento / to take oath = fazer juramento / (obs.: jurar = to swear) |
| oats | aveia (Avena sativa) |
| oblivion / oblivious | esquecimento = the state of something that is not remembered, used, or thought about any more; "the names of the people who lived here long ago have faded into oblivion" // esquecido; oblivious of = esquecido de, inconsciente de |
| obnoxious | insolente, detestável = unpleasant in a way that makes people feel offended, annoyed, or disgusted; hateful; offensive; "some teenagers were being loud and obnoxious" |
| obscene | obsceno, indecente = dirty, nasty, filthy, indecent |
| ocher; ochre | ocre (cor) |
| octopus | polvo |
| ointment | pomada |
| omelet; omelette | omelete |
| omen / ominous | agouro, presságio; "evil omen" / agourento, nefasto, preocupante, de mau agouro = suggesting that something bad is going to happen in the future; "an ominous threat of war" |
| onslaught | ataque violento; investida = an especially fierce attack; something resembling such an attack; "an onslaught of technological changes" |
| oracle | oráculo, profecia |
| orb | orbe, globo, esfera |
| orchard | pomar; "beyond the vegetable garden is an orchard with a variety of fruit trees" |
| orchid | orquídea (fam: Orchidaceae) |
| ordeal | experiência difícil; provaçâo, suplicio = any very severe, difficult, or trying test, experience, or trial; "the hikers were finally rescued after a three-day ordeal in the wilderness" |
| ore | minério / iron ore = minério de ferro / to dig ore = extrair minério |
| ounce (abrev.: oz) | onça (peso) = aprox. 31 g |
| oust (to) | expulsar, remover, exonerar = to expel, remove, or force (someone) from a place or position occupied |
| outburst | explosão (raiva, choro, etc) = a sudden and often violent release, outpouring, or eruption: |
| outcast | rejeitado, excomungado, pária = a person who is rejected or cast out, as from home or society |
| outlet | 1) tomada (eletricidade) (fêmea) = socket; "the plug must be inserted fully into the power outlet or the appliance will not work" // 2) loja de varejo; loja de venda de ponta de estoque; posto de venda = retail outlet |
| outsource (to) / outsourcing | terceirizar // terceirização, trabalho feito por outra empresa, normalmente fora da empresa-cliente; "the company outsources everything except core competencies" / (obs: contractor = empresa que fornece recursos para trabalhar como terceiros na empresa-cliente) |
| ovation | aclamação, ovação |
| overdraft | saque a descoberto; overdrafting checking = cheque especial |
| overdue | vencido e não pago (conta; título); em atraso = unpaid when due |
| overflow (to) / overflow (n) | inundar, transbordar; "books and papers overflowed his desk" // 1) excesso, abundância // 2) inundação; alagamento = flood, inundation; "the river overflowed its banks" |
| overhaul / overhaul (to) | revisão completa (mecânica) = thorough repair // revisar, reparar |
| overlay / overlay (to) | camada, revestimento, cobertura = something laid or applied over something else / pôr camada; cobrir; revestir |
| overload (to) / overload (n) | sobrecarregar; abarrotar // sobrecarga / information overload = excesso de informações |
| overlook (to) / overlook (n) | 1) ver do alto = to look down upon from above // 2) passar por alto, não ver, não fazer caso, ignorar; "the opportunity should not be overlooked"; "the detective overlooked an important clue" // mirante, belvedere = a high place with a good view; "there's a great overlook where you can get a panoramic view of the valley below" |
| overly | excessivamente; "overly curious"; "overly formal" |
| overrate (to) | exagerar o valor; superestimar = overestimate |
| override (to) | 1) cancelar, anular, ignorar = to give a command that cancels the effect of something; "press that button to override the system" // 2) sobrepor // 3) passar por cima = to prevail over |
| overrun (to) | transpor; ultrapassar = to run beyond, to overflow |
| oversee (to) | inspecionar, supervisionar = to direct workers as a supervisor; to supervise |
| overtake (to) | ultrapassar = to move past (another vehicle or person) travelling in the same direction |
| overt | não oculto, aberto, público, evidente, manifesto = open to view; observable |
| owing to | devido a; por causa de = because of; "they were late, owing to the traffic" |
| ox | boi |
| oyster | ostra |
