The missing definition here is perhaps the one in the Lexica Segueriana (s.v. meta/melos), citing 'Thucydides'. (See Thuc. 3.36.4, the notorious Athenian change of mind about punishing the rebellious population of Mytilene.)
(For a longer one, see ps.-Zonaras s.v.: gnwsi/ws a)po\ ptai/smatos e)pi\ to\ e)nanti/on a)gaqo\n e)pistrofh/.)