それで大丈夫です。

The phrase 'それで大丈夫です' (Sore de daijōbu desu) is a combination of several common Japanese words. 'それ' (sore) is a demonstrative pronoun meaning 'that' or 'it.' 'で' (de) is a particle that can indicate a means, cause, or state, among other things. In this context, it functions to connect 'sore' to the following phrase, implying 'with that' or 'by means of that.' '大丈夫' (daijōbu) is an adjective (or more precisely, a 'na-adjective') that means 'all right,' 'okay,' 'safe,' 'secure,' 'no problem,' or 'fine.' The kanji are 大 (dai, meaning 'big' or 'great') and 丈夫 (jōbu, meaning 'strong,' 'healthy,' or 'robust'). Historically, 丈夫 (jōbu) was used to refer to a strong man or a person of great stature, and later evolved to mean something that is sturdy, reliable, or healthy. The combination '大' and '丈夫' therefore emphasizes a state of being completely secure, fine, or without issue. Finally, 'です' (desu) is a polite copula, equivalent to 'is' or 'it is,' which makes the sentence polite and formal. So, literally, it could be understood as 'With that, it is all right/fine,' or more naturally, 'That's fine' or 'That's okay.' The evolution of '大丈夫' from a physical robustness to a general state of being acceptable or without concern is a key part of its semantic development.