The headword is present indicative active, third person plural, of krw/zw. (For this verb see already kappa 2492; and cf. generally kappa 2491.) Its attestions are rare: Callimachus (Epigrams fr. 393 Pfeiffer, quoted by Sextus Empiricus), Lucian (Electrum 5), and George the Monk (PG 110.636.47). Of these perhaps commentary on Callimachus is the likeliest source.
Adler cites the Ambrosian Lexicon (1704) for comparison.
[1] This phrase is absent (Adler reports) from mss AF, and appears misguided: all surviving attestations of this word (see previous note) concern animate entities, specifically birds.