thank (th?ngk)tr.v. thanked, thank·ing, thanks 1. To express gratitude to; give thanks to: He thanked her for the gift.2. To hold responsible; credit: We can thank the parade for this traffic jam.3. Used ironically in the future tense to express a rebuke: I’ll thank you to keep quiet until the presentation is finished.[Middle English thanken, from Old English thancian; see tong- in Indo-European roots.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.thank (?æ?k) vb (tr) 1. to convey feelings of gratitude to2. to hold responsible: he has his creditors to thank for his bankruptcy. 3. used in exclamations of relief: thank goodness; thank God. 4. I’ll thank you to used ironically to intensify a command, request, etc: I’ll thank you to mind your own business. [Old English thancian; related to Old Frisian thankia, Old Norse thakka, Old Saxon, Old High German thanc?n]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014thank (?æ?k) v.t. 1. to express gratitude or appreciation to. 2. to hold personally responsible; blame: We have him to thank for this lawsuit. n. 3. thanks, a grateful feeling or acknowledgment of a kindness, favor, or the like, expressed by words or otherwise. interj. 4. thanks, I thank you. Idioms: 1. thanks to, because of; owing to. 2. thank you, (a common elliptical expression used to express gratitude or appreciation, as for a gift or favor.) [before 900; (n.) Middle English: goodwill, gratitude, expression of thanks, Old English thanc expression of thanks, c. Old Frisian, Old Saxon thank, Old High German danc, Old Norse th?kk, Gothic thagks; (v.) Middle English thanken, Old English thancian; akin to think1] usage.: See welcome. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.thank1. ‘thank you’Thank is mainly used in the expressions Thank you and Thanks.Be Careful!Don’t say ‘Thanks you’ or ‘Thanks you a lot.Thank is also a verb. If you thank someone, you show that you are grateful for something they have done or something they have given you.You say that you thank someone for something.You can also thank someone for doing something.Be Careful!Don’t use ‘to’. Don’t say, for example, ‘He thanked me to bring the sandwiches’.