The headword phrase is evidently quoted from somewhere. Its verb is the imperfect indicative active, third person singular, of u(fi/hmi (I let down, put under, suborn, surrender, abate); cf. upsilon 731.
[1] The glossing verb is the same form as the headword verb, but from e)ndi/dwmi, I give in. Adler notes that the lemma is identically glossed at Lexicon Ambrosianum 652; cf. ps.-Zonaras 1790.14-5 and Hesychius s.v. u(fiei/s.