Comments: A very productive PN root with rich Ablaut. It forms two vowel grade pairs:
1) PN term. *-ill- (also with a *ʕ- preverb) > Chech. ʕill- "lie", -ill- "put upon (smth.)", Ing. -ill- "put", Bacb. -ill- id. / dur. *-ē-b-l > Bacb. -ebl- "put upon, inside". The root is also used with a t- prefix ( *t-ill- 'to put (from above)' > Chech., Ing., Bacb. till-, dur. *t-ēbl- > Bacb. tebl-.
2) PN intr. *-āll- > Chech. -all- (-äll-ira) "be (put) inside", Ing. -all- (-oall-) "to be inside", all- "lie" / tr. *-ōll- > Chech., Ing., Bacb. -oll- "to put inside, put in".
There are also some common Nakh forms with a single *-l- (geminated *-ll- in the forms listed above is either expressive, or reflects old suffixation). Besides *-ēbl- 'to put upon, inside' cf. also PN *=ōl- / *=ēbl- 'to begin' (Chech. =ōl-, Ing. =ol-, Bacb. =ol- / =ebl-), =āl- / *=ēbl- 'to finish' (Chech. =āl-/=īl-/=owl-, Ing. =al-). The semantic change 'to put > to begin/finish' ('*to put a beginning/end') is widely spread in Caucasian languages.
An old nominal derivate is PN *lol ( < *r-ol = PC *rɨLǝ, PA *riƛV-) "leathern loop on belt for hanging up the dagger" (= "receptacle, place to put smth. in"), reflected in Chech. lol (lala-ra-), Ing. lol (lala-ro).
[The productiveness of this root in PN may be explained by the fact that it probably reflects a merger of two EC roots: *-ä̆ƛĔw and *-iŁV 'to put'.]
Comments: Bacb. bist in Matsiyev's notation (Kadagidze: bisṭ). Vowel length unclear (because of the consonant cluster). One of the stems with changing class prefixes.
Comments: PN *=ōʁ- is the terminative stem; durative (with infix and Ablaut) *=ē-b-ʁ- is reflected in Chech. =īʁ- (with the same meaning).
The intransitive Ablaut correlate with *-ā- is PN *=āʁ- 'to sit'. Vowel length here can be established by the Ing. pret. =äʁaw. In Bacb. the root is preserved in the compound ʕe=aʁ- "to sit". This is one of the relatively rare cases of the *a/*o "intransitive/ transitive" Ablaut in PN.
Comments: The auxiliary verb "to be", used only in the present tense. The -u-vocalism in Chech. is probably secondary (*u_-i > *w-u in the first class, whereas *-i > -a in other classes).
Comments: A participle form from PN *=uc̣- "to be filled, satiated" (Chech. =uz-, Bacb. =uc̣-). It is rather probable, that PN *=ac̣-i(n) 'heavy' (Chech., Ing. =eza, Bacb. =ac̣ĩ, Cheb. =azĩ, Khild. =eʒĭ etc; the pure root is preserved in Chech. =az-dan "make expensive", Bacb. =ac̣-dar "make heavy") is an Ablaut variant of the same stem.
Comments: In Chech. cf. also -üħ-ig 'end' (with changing class prefixes). In Bacb. the root is present also in the compound joħ-koṭŏ,doħ-koṭŏ 'face' and in adverbs -ujħ-ṭeχ (with changing class prefixes) 'face down', dujħrẽ 'at first' and juħal 'on the other side (of a river, ravine)'.
The same root served as stem in the derivate *ɦi-ri-n ( < *-uHi-ri-n) 'sharp' > Chech., Ing. ira, Bacb. ʕirĩ.