Usually, thanks.a grateful feeling or acknowledgment of a benefit, favor, or the like, expressed by words or otherwise: to return a borrowed book with thanks.
–interjection
4.
thanks, (used as an informal expression of gratitude, appreciation, or acknowledgment).
—Idioms
5.
have oneself to thank, to be personally to blame; have the responsibility: The citizens have only themselves to thank for corruption in government.
6.
thanks to, because of; owing to: Thanks to good organization and hard work, the benefit concert was a great success.
7.
thank you, (used interjectionally to express gratitude, appreciation, or acknowledgment, as for a gift, favor, service, or courtesy).
[Origin: bef. 900; (n.) ME: favorable thought, goodwill, gratitude, (in sing. and pl.) expression of thanks; OE thanc (in sing.) expression of thanks, orig., thought, thoughtfulness; (v.) ME thanken, OE thancian (c. D, G danken); akin to think1]
O.E. þancian "to give thanks," from P.Gmc. *thankojan (cf. O.S. thancon, O.N. þakka, Dan. takke, O.Fris. thankia, M.Du., Ger. danken "to thank"), from *thankoz "thought, gratitude," from PIE base *tong- "to think, feel." For sense evolution, cf. related O.E. noun þanc, þonc, originally "thought," but by c.1000 "good thoughts, gratitude." The whole group is from the same root as think (q.v.). In ironical use, "to blame," from 1560. Thankful is from O.E. þancfulle;thankless "likely to not be rewarded with thanks" is from c.1547. Thank you is attested from c.1400, short for I thank you. To thank (someone) for nothing is recorded from 1703.
to express appreciation or gratitude to (someone) for a favour, service, gift etc Example: He thanked me for the present; She thanked him for inviting her.
Thank\ (th[a^][-n]k), n.; pl. Thanks. [AS. [thorn]anc, [thorn]onc, thanks, favor, thought; akin to OS. thank favor, pleasure, thanks, D. & G. dank thanks, Icel. [thorn]["o]kk, Dan. tak, Sw. tack, Goth. [thorn]agks thanks; -- originally, a thought, a thinking. See Think.] A expression of gratitude; an acknowledgment expressive of a sense of favor or kindness received; obligation, claim, or desert, or gratitude; -- now generally used in the plural. "This ceremonial thanks." --Massinger. If ye do good to them which do good to you, what thank have ye? for sinners also do even the same. --Luke vi. 33. What great thank, then, if any man, reputed wise and constant, will neither do, nor permit others under his charge to do, that which he approves not, especially in matter of sin? --Milton. Thanks, thanks to thee, most worthy friend, For the lesson thou hast taught. --Longfellow. His thanks, Her thanks, etc., of his or her own accord; with his or her good will; voluntary. [Obs.] Full sooth is said that love ne lordship, Will not, his thanks, have no fellowship. --Chaucer. In thank, with thanks or thankfulness. [Obs.] Thank offering, an offering made as an expression of thanks.
Thank\, v. t. [imp. & p. p. Thanked; p. pr. & vb. n. Thanking.] [AS. [thorn]ancian. See Thank, n.] To express gratitude to (anyone) for a favor; to make acknowledgments to (anyone) for kindness bestowed; -- used also ironically for blame. "Graunt mercy, lord, that thank I you," quod she. --Chaucer. I thank thee for thine honest care. --Shak. Weigh the danger with the doubtful bliss, And thank yourself if aught should fall amiss. --Dryden.