be substantive (verb) matter: be of consequence, importance
Sinonime: abandon, be unfaithful, bite the hand that feeds you, blow the whistle,
bluff, break faith, break promise, break trust, break with, commit treason,
cross,
deceive, deliver up,
delude,
desert, double-cross,
finger*,
forsake, go back on, inform against, inform on, jilt,
knife*,
let down,
mislead, play Judas, play false,
seduce, sell down the river, sell out, stab in the back,
take in*,
trick, turn in, turn informer, turn state's evidence, walk out on
Antonime: be faithful, be loyal,
defend,
protect,
support