Monosyllabic Turkic stems

Some monosyllabic Turkic verb stems are avoided in certain modern languages, though derived forms exist.

Old Turkic	gloss	modern forms	other cognates
boğ-	choke, strangle	(kir) muunt-	Mong. *boğu- (?)
ay-	say	(kir, kaz) ayt-
kay-	return	(kir, kaz) qayt-
baː-	tie	(kir, kaz) bayla- (kir) boo / (kaz) baw (n.)
saq-	think → miss	(kir, kaz) sağın-
yüd-	load	(kir) jüktö-, (uzb) yukla-, ... (←yü-k+LA)
ud-	sleep	(kir) uqta-, (kaz) uyıqta- (← ud-ıq-LA)
u-	(not) be able to?
qo-	put		merged with qoy-
sı-	break	(kaz/kir) sın(-dır)-
ıd-	send	(kaz/kir) jiber-, (kir) iy-
sü	army

Some other underived forms that were lost:

• köti- "be lifted" → kötir-(kaz), kötür-(kir) "lift"

Some short vowel stems that were lengthened?

Old Turkic	gloss	modern forms	other cognates
yu-	wash	juu (kir), juw (kaz)

Some long vowels were unexpectedly preserved as long?

Old Turkic	gloss	modern forms	other cognates
yā	bow	jaa (kir)
keʧæ	yesterday	keçee (kir)

Some words were unexpectedly shortened??

Old Turkic	gloss	modern forms	other cognates
sub	water	su (tur)	suu (kir) etc.