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to sleep

Source:*sъpatiProto-Slaviccertain

The weak yer of *sъpati vanished everywhere, leaving the cluster sp-.

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English

to sleep

Polish

spać

spatɕ

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In all five languages

BCS script

Latin under Cyrillic

Russian
спатьspatʹ
spatʲinherited
Ukrainian
спа́тиspaty
ˈspatɪinherited
Polish
spać
spatɕinherited
Czech
spát
spaːtinherited
Bosnian-Croatian-Serbian
spavatiспавати
ˈspavatiinherited
The extended form spavati is the everyday infinitive (spavam 'I sleep').
English
to sleep