The headword, presumably extracted from the quotation given, is the aorist active infinitive of the verb tina/ssw (I shake, shake off); see generally LSJ s.v.
[1] The glosses are the same form as the lemma; the first is from the verb diarrh/gnumi, I break through, the second from the verb ko/ptw, I cut, strike; see generally LSJ s.vv.
[2] Greek Anthology 5.230.3-4 (web address 1), an amatory epigram attributed to the Christian poet Paulus Silentiarius (d. ca. 580 CE); cf. OCD(4) s.v., PLRE s.v. Paulus (21), and Wheeler (8-17). The quotation is the first clause of a me/n- de/ compound sentence that describes how Doris bound her lover with a single golden hair, which he did not have the strength to break. See another extract from this epigram at epsilon 319.