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1.
Japanese word meaning, "I am sorry".
Sometimes used together with doumo. "Doumo sumimasen" also means I'm sorry.

Often in conversation "doumo sumimasen" or "sumimasen" are used in place of "Thank you". Perhaps Japanese feeling is, I'm sorry bothering you, but thank you very much to be so considerate.
1. Sumimasen I broke your dish.
2. When a gentle person gives away a seat on a crowded train to an aged person, the person who received the favor may say, "sumimasen" or "doumo sumimasen".
by Ramunenakayama November 27, 2007
 
2.
Sorry or Excuse me in Japanese
When you do something wrong: "Sumi masen"
by Franz Li January 31, 2006