どうも 1) Very Much 2) Not Sure

1) truly; really; very much
2) I’m not sure

Used to stress the meaning of a sentence or to show doubt.
例文 EXAMPLE SENTENCE
どうもありがとうございます。
very much-thanks-(polite)
Thank you very much.
Vocabulary & Notes
うちの子がお世話になったそうで、どうもすみません。
our-child-(subject marker)-aid-became-appears to have-very-sorry
I want to thank you for troubling to help our child.
Vocabulary & Notes
Example for usage #2: (not sure; stresses doubt)
どうも分かりませんので、もう一度言ってください。
very-not sure-not understand-therefore-more-one-time-speak-please
I simply can’t get it, Could you say it one more time?
Vocabulary & Notes
COMMENTS
It is mainly used with ありがとう and すみません.
Note: often どうもありがとう is shortened to just どうも. Another variant is saying どうも twice – どうもどうも