Украинско-английский словарь - віддячити

to thank, to offer one's thanks;to show one's gratitude, to return somebody's kindness;to repay, to recompense, to reward (за послугу, службу);to retaliate, to requite (with, for);to reciprocate (чимсь with);

віддякувати тим же — to pay one in his own coin, to requite like for like, to give tit for tat (blow for blow);я не можу віддячити вам за вашу ласку І — can make no return for your kindness.