[t+t], [d+d] from suffixion became [st], [zd]; [{ttʰd}+t|d+d] > [st|zd]

[t+t], [d+d] from suffixion became [st], [zd]; [{ttʰd}+t|d+d] > [st|zd]

References ✧ PE18/102; PE19/82, 84, 87, 90; VT42/18

Phonetic Rule Elements

[t+t] > [st] ✧ PE18/102 (tt > tʰt > tˢt > st; suffixal); PE19/82 (t+t > st); PE19/84 (t+t > tˢt > st); PE19/87 (t+t > tˢt > st); PE18/91 (t-t > st); VT42/18 (t-t > st)
[tʰ+t] > [st]
[d+t] > [st]
[d+d] > [zd] ✧ PE18/102 (dd > dʰd > dᶻd > zd; suffixal); PE19/82 (d+d > zd); PE19/90 (d+d > dᶻd > zd); PE18/91 (d-d > st)

Phonetic Rule Examples

reddā > rezdā d+d > zd reddā > rezdā > Q. resta ✧ PE19/91
reddā > rezdā d+d > zd reddā > Q. resta ✧ PE19/92
reddā > rezdā d+d > zd reddā > rezdā > S. rîdh ✧ PE19/91
> zd d+d > zd d-d > Q. st ✧ PE18/91
-dde > -zde d+d > zd dd > zd > Q. -ste ✧ VT49/33
-dde > -zde d+d > zd dede > dde > zde > Q. ste ✧ VT49/33
-dde > -zde d+d > zd dde > zde > Q. -ste ✧ VT49/46
-dde > -zde d+d > zd de > d-de > Q. -ste ✧ VT49/51
kʰotta- > kʰosta- t+t > st khot-ta > Q. hosta ✧ PE17/39
lotta- > losta- t+t > st lotta- > Q. losta ✧ VT42/18
mattimā > mastimā t+t > st matˢtimā > Q. mastima ✧ PE22/137
-tte > -ste t+t > st tt > st > Q. -ste ✧ VT49/33
-tte > -ste t+t > st te/se > t-te > -ste > Q. -tte ✧ VT49/51
cetʰta- > cesta- tʰ+t > st KEÞ > Q. kesta ✧ PE17/156
patʰta- > pasta- tʰ+t > st PĂTH > Q. pasta- ✧ PE17/171

ᴹ✶[t+t], [d+d] from suffixion became [st], [zd]; [{ttʰd}+t|d+d] > [st|zd]

GS/§4.7 GS/§4.8 GS/§4.9 WGCH/§87ii [PIE tt > tˢt > Germ/It/Kelt ss] WGCH/§91ii [PIE dd, td > dᶻd > Kelt zd] @@@

References ✧ PE18/41-42, 54, 65; PE19/39

Phonetic Rule Elements

[t+t] > [st] ✧ PE19/51 (t-t > st; older)
[tʰ+t] > [st]
[d+t] > [st]
[d+d] > [zd] ✧ PE19/51 (d-d > zd)

Phonetic Rule Examples

reddā > rezdā d+d > zd ᴹ✶reddā/red-tā > ᴹQ. resta ✧ EtyAC/RED
reddā > rezdā d+d > zd ᴹ✶reddā/red-tā > N. rîð ✧ EtyAC/RED
rodta- > rosta- d+t > st ᴹ√ROD > ON. rostóbe ✧ Ety/ROD
sjadta > sjasta d+t > st ᴹ✶syad-ta > N. hast ✧ Ety/SYAD
wedtā > westā d+t > st ᴹ✶wed-tā > N. gwest ✧ Ety/WED
wedta- > westa- d+t > st ᴹ✶wed-tā > N. gwesto ✧ Ety/WED
kotta > kosta t+t > st ᴹ✶kot-t- > ᴹQ. kosta- ✧ Ety/KOT
kotte > koste t+t > st ᴹ✶kot-t- > N. cost ✧ Ety/KOT
kʰotʰta- > kʰosta- tʰ+t > st ᴹ√KHOTH > ᴹQ. hosta- ✧ Ety/KHOTH
kʰotʰta > kʰosta tʰ+t > st ᴹ√KHOTH > N. host ✧ Ety/KHOTH