of |ʌv| — 1621, Robert Burton, The Anatomy of Melancholy, II.5.3.ii:

ofay |ˈəʊfeɪ| — (US, pejorative, slang) a white person.

off |ɔːf| — kill intentionally and with premeditation

off-balance |ˈɒfˈbæləns| — Not physical balanced; not having physical equilibrium.

off-center  — situated away from the center or axis

off-chance |ˈɒftʃɑːns| — (idiomatic) A condition of not being likely or probable.

off-color  — in violation of good taste even verging on the indecent

off-colour |ˌɒfˈkʌlər| — in violation of good taste even verging on the indecent

off-day |ˈɒf deɪ| — a day when things go poorly

off-hand |ˈɒfˈhænd| — without preparation

off-hour |ˈɒfˈaʊə| — (US) A period when traffic is light

off-key |ˈɔːfˈkɪ| — inaccurate in pitch

off-licence |ˈɒf laɪsns| — a store that sells alcoholic beverages for consumption elsewhere

off-limits |ˈɒfˌlɪmɪts| — barred to a designated group

off-line  — not on a regular route of a transportation system

off-load |ˈɑːfləʊd| — Alternative spelling of offload.

off-putting |ˌɒf ˈpʊtɪŋ| — causing annoyance or repugnance

off-road |ɒfˈrəʊd| — Alternative spelling of off-road.

off-site  — taking place or located away from the site

off-stage |ˈɒfˈsteɪdʒ| — Alternative form of offstage.

off-street |ˈɒf striːt| — not on the streets

off-the-cuff |ˈɒfðəˈkʌf| — with little or no preparation or forethought

off-white |ˌɒf ˈwaɪt| — a shade of white the color of bleached bones

offal |ˈɔːfl| — viscera and trimmings of a butchered animal often considered inedible by humans

offbeat |ˌɔːfˈbiːt| — an unaccented beat (especially the last beat of a measure)

offcast |ˈɔːfˌkæst| — To cast off; shed.

offcut |ˈɔːfkʌt| — To cut off.

offence |əˈfens| — the action of attacking an enemy

offend |əˈfend| — cause to feel resentment or indignation

offender |əˈfendər| — a person who transgresses moral or civil law

offending |əˈfendɪŋ| — offending against or breaking a law or rule

offense |əˈfens| — a lack of politeness; a failure to show regard for others; wounding the feelings or others

offensive |əˈfensɪv| — the action of attacking an enemy

offer |ˈɔːfər| — the verbal act of offering

offered |ˈɒfərd| — simple past tense and past participle of offer

offering |ˈɔːfərɪŋ| — something offered (as a proposal or bid)

offertory |ˈɔːfərtɔːrɪ| — the offerings of the congregation at a religious service

offhand |ˌɔːfˈhænd| — without previous thought or preparation

offhanded |ˌɒfˈhændɪd| — without previous thought or preparation

offhandedly |ˌɒfˈhændɪdlɪ| — without previous thought or preparation

office |ˈɔːfɪs| — place of business where professional or clerical duties are performed

office-bearer |ˈɑːfəs beərər| — the person who holds an office

office-boy |ˈɑːfəs bɔɪ| — A boy or junior clerk employed in a professional office to perform odd jobs, such as running errands or making copies.

officeholder |ˈɑːfəs həʊldər| — someone who is appointed or elected to an office and who holds a position of trust

officer |ˈɔːfɪsər| — any person in the armed services who holds a position of authority or command

offices |ˈɑːfəsəz| — plural form of office

official |əˈfɪʃl| — a worker who holds or is invested with an office

officialdom |əˈfɪʃldəm| — people elected or appointed to administer a government

officialese |əˌfɪʃəˈliːz| — the style of writing characteristic of some government officials: formal and obscure

officialism |əˈfɪʃəˌlɪzəm| — The rigid, perfunctory and literal adherence to official duties and regulations

officialize |əˈfɪʃəˌlaɪz| — make official

officially |əˈfɪʃəlɪ| — in an official role

officiant |əˈfɪʃiːənt| — a clergyman who officiates at a religious ceremony or service

officiary |əˈfɪʃiːˌeriː| — Of or pertaining to an office or an officer; official.

officiate |əˈfɪʃɪeɪt| — act in an official capacity in a ceremony or religious ritual, such as a wedding

officinal |əˈfɪsənl| — Medicinal.

officious |əˈfɪʃəs| — intrusive in a meddling or offensive manner

officiousness |əˈfɪʃəsnəs| — aggressiveness as evidenced by intruding; by advancing yourself or your ideas without invitation

offing |ˈɔːfɪŋ| — the near or foreseeable future

offish |ˈɒfɪʃ| — lacking cordiality; unfriendly

offishness  — Quality of being offish.

offload |ˌɔːfˈləʊd| — transfer to a peripheral device, of computer data

offprint |ˈɔːfprɪnt| — a separately printed article that originally appeared in a larger publication

offscourings |ˈɒfˌskaʊərɪŋz| — plural form of offscouring

offset |ˈɔːfset| — the time at which something is supposed to begin

offshoot |ˈɔːfʃuːt| — a natural consequence of development

offshore |ˌɔːfˈʃɔːr| — at some distance from the shore

offside |ˌɔːfˈsaɪd| — (sport) the mistake of occupying an illegal position on the playing field (in football, soccer, ice hockey, field hockey, etc.)

offspring |ˈɔːfsprɪŋ| — the immediate descendants of a person

offstage |ˌɔːfˈsteɪdʒ| — a stage area out of sight of the audience

oft |ɔːft| — many times at short intervals

often |ˈɔːfn| — many times at short intervals

oftentimes |ˈɔːfntaɪmz| — many times at short intervals

ofttimes |ˈɔːftˌtaɪmz| — many times at short intervals