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The Japanese word

有り難う

is pronounced
arigatou | ありがとう
means
Thank you
Examples:
有り難う、どうぞ頼みます。
arigatā, dōzo tanomi masu.
Thank you. Please do.
十分頂きました、有り難うございます。
jūbun itadaki mashi ta, arigatā gozai masu.
I've had enough, thank you.
傘を貸してくださってたいへん有り難うございました。
kasa o kashi te kudasatte taihen arigatā gozai mashi ta.
It was very kind of you to lend me an umbrella.
すてきな贈り物をいただきご親切に有り難うございました。
suteki na okurimono o itadaki go shinsetsu ni arigatā gozai mashi ta.
It was very kind of you to give me a nice gift.
色々と有り難うございます。忘れないように彼はそれを書き留めた。
iroiro to arigatā gozai masu. wasure nai yō ni kare wa sore o kakitome ta.
Thank you very much for everything. He wrote it down lest he should forget it.
Examples sourced from tatoeba.org