noun
(obsolete) singular of thanks (“an expression of appreciation or gratitude; grateful feelings or thoughts; favour, goodwill, graciousness”)
verb
To express appreciation or gratitude toward (someone or something).
In the future tense in the form one will thank someone to do something, chiefly expressing a command or criticism: to request that (someone) do something.
To express appreciation or gratitude for (something).
To respond to (someone) out of, or as if out of, appreciation or gratitude.
Chiefly followed by for: to credit or hold (someone or something) responsible, especially for something negative; to blame.
(intransitive, obsolete) To express gratitude.