RP

ɔɪ

Latín small letter open o + small upper case i

Front, closing and wide.

The glide of RP/ɔɪ/ begins at a central position, between half-open and half-close, and moves in the direction of RP /ɪ/ nearer to a centralised half-close position [ё˕]. There is a slight closing movement of the lower jaw, and the lips are neutral for the first element but have a tendency to round on the second segment. The starting point may have a tongue position similar to RP /ɒ/. Before [ɫ], the second segment tends to be absorbed into [ə] or [ʊ] glide (e.g. boil [bɔ:əɫ]). On the other hand, RP/ɔɪ/ has an equivalent glide in Spanish as in e.g. voy (Span. 'I go'), although as usual, in English the first element is more open and the second more relaxed.

Spelling
<oi, oy> boil /bɔɪl/, toilet /ˈtɔɪlɪt/ , joy /dʒɔɪ/, oysters /ˈɔɪstəz/
German names and borrowings: Kreutzer /ˈkrɔɪtsə/ , Plattdeutsch /ˈplætdɔɪtʃ/
Rare case:
<uoy> buoy /bɔɪ/
Examples
toy /tɔɪ/
noise /nɔɪz/
voice /vɔɪs/
Freud /frɔɪd/
oyster /ˈɔɪstə/
destroyed /dɪˈstrɔɪd/
tabloid /ˈtæblɔɪd/
flamboyant /flæmˈboɪənt/
The engine of Joyce's Rolls Royce makes an annoying noise, which is probably due to lack of oil.

/ði ˈendʒɪn əv ˈdʒɔɪsəz ˌrəʊlz ˈrɔɪs ˈmeɪks ən əˈnɔɪɪŋ ˈnɔɪz wɪtʃ ɪz ˈprɒbəbli dju: tə ˈlæk əv ˈɔɪl/

Spoilt boys usually enjoy destroying noisy toys.

/ˈspɔɪlt ˈbɔɪz ˈju:ʒəli ɪnˈdʒoɪ dɪˈstroɪɪŋ ˈnɔɪzi ˈtɔɪz/

What noise annoys an oyster most? A noisy noise annoys an oyster most.

/ˈwɒt ˈnɔɪz əˈnɔɪz ən ˈɔɪstə ˈməʊst || ə ˈnɔɪzi ˈnɔɪz əˈnɔɪz ən ˈɔɪstə ˈməʊst/

Pronunciation

The tongue is below the back half-open position and moves upwards towards a centralised close front position. The lips change from an open rounded to a neutral position. The soft palate is raised (unless followed by a nasal).

PSp

oj

Lower case o + lower case j

Falling diphthong

The first sound in this diphthong is a vowel and the second element is a semivowel. The articulators move from a half open position to a close position. The vocal folds vibrate during the production of this sound.

Spelling
<oi, oy>
Examples
oiga
heroico
voy
Vaya coincidencia coincidir en la boina.
Pronunciation

The first sound is a vowel and the second element is a semivowel. The articulators move from an half open position to a close position. The vocal folds vibrate during the production of this sound