_to fly_.

[a] > [ae]: {l[ae]re} (OHG. {l[a]ri}), _empty_; {m[ae]re} (OHG. {m[a]ri}),
_renowned_; {s[ae]jen} (OHG. {s[a]jan}), _to sow_; pret. subj. {n[ae]me}
(OHG. {n[a]mi}), pl. {n[ae]men} (OHG. {n[a]m[i]m}), inf. {n[e:]men},
_to take_.

[o] > [oe]: {h[oe]her} (OHG. {h[o]hiro}), _higher_; {h[oe]hest} (OHG.
{h[o]histo}), _highest_; {h[oe]ren} (OHG. {h[o]ren}, from older
{*h[o]rjan}), _to hear_; {sch[oe]ne} (OHG. {sc[o]ni}), _beautiful_.

[u] > iu: pl. {briute} (OHG. {br[u]ti}), _brides_; {hiuser} (OHG. {h[u]sir}),
_houses_.

Traces of the umlaut of {[u]}, written {iu} (= {[=u:]}), occur in late OHG.
monuments of the tenth century. It is common in the writings of Notker
(d. 1022), as {hiute} older {h[u]ti}, _skins_; {chriuter} older {chr[u]tir},
_herbs_. In other writings of the tenth to the twelfth century the
umlaut of {[u]} is seldom found. Umlaut did not take place in Upper German
before a following {m}, as {r[u]men} from {*r[u]mjan}, _to make room_;
{s[u]men} from {*s[u]mjan}, _to tarry_.

ou > [o:]u, often written {eu}, rarely {oi}, {[o:]i}: {l[o:]ufel} (OHG.
{loufil}), _runner_; {l[o:]uber} (OHG. {loubir}), _leaves_.

Umlaut of {ou} did not take place in the combination {ouw} = OHG. {ouw},
{auw}, West Germanic {aww}, primitive Germanic {awj}, as {frouwe} (OHG.
{frouwa}, prim. Germanic {*frawj[o]-}), _woman_; {ouwe} (OHG. {ouwa},
{auwia}, prim. Germanic {*a([zh])wj[o]-}), _meadow_; {frouwen} (OHG.
{frouwen}, prim. Germanic {*frawjan}), _to rejoice_, and similarly
{douwen}, _to digest_, {drouwen}, _to threaten_, {strouwen}, _to strew_.
Forms like {fr[o:]uwen}, {d[o:]uwen}, {dr[o:]uwen}, {str[o:]uwen} were
analogical formations due to the influence of the pres. second and third
pers. singular and the preterite which regularly had umlaut; see the
Author's Historical German Grammar, Sec. 232.

Umlaut of {ou} did not take place in Upper German before labials and
{g}, as {erlouben}, _to allow_, {gelouben}, _to believe_, {houbet},
_head_, {koufen}, _to buy_, {troumen}, _to dream_, {toufen}, _to
baptize_, {bougen}, _to bend_, {ougen}, _to show_, beside Middle German
{erl[o:]uben}, {gel[o:]uben}, {h[o:]ubet}, {k[o:]ufen}, {tr[o:]umen},
{t[o:]ufen}, {b[o:]ugen}, {[o:]ugen}.

uo > [u:]e: {gr[u:]ene} (OHG. {gruoni}), _green_; {g[u:]ete} (OHG. {guot[i]}),
_goodness_; {v[u:]e[z]e} (OHG. {fuo[z]i}), _feet_; pret. pl. subj. {v[u:]eren}
(OHG. {fuor[i]m}), _we might go_, inf. {varn}, _to fare_, _go_; {buoch},
_book_, dim.