віддячити

недок. віддячувати, док. віддячити

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

віддячити 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 — I can make no return for your kindness