The transmitted headword parapenqei=s, attested only here, is a faulty transcription of paratenei=s (you will stretch out alongside, stretch out on the rack, inflict torture), the future indicative active, second person singular, of the verb paratei/nw; see generally LSJ s.v. and cf. other forms of this verb at pi 461 and pi 463. Other lexica correctly transmit paratenei=s (see next notes), and, as Adler comments in her critical apparatus, this correction would restore the lemma's alphabetical order.
The (correct) headword paratenei=s must be quoted from somewhere; there are surviving instances in Menander (Samia 421 and 544), Philostratus and Plotinus.
[1] This gloss is the future indicative active, second person singular, of the verb a)po/llumi, I lose, destroy; see generally LSJ s.v. Same gloss elsewhere: Hesychius pi704; Timaeus, Platonic Lexicon pi999a21; Photius, Lexicon pi317 Theodoridis. [Adler notes that ms V transmits a)peilei=s (you threaten, menace) and ms M inserts paratenqei/s, an otherwise unattested form, above the lemma.]
[2] The verb form is the same, but from parelku/w (also pare/lkw), I draw along, out; see generally LSJ s.v. The aforementioned entries in Timaeus and Photius transmit this same gloss as well.