sorry to bother you, but ...
A polite fixed expression used before making a request. It acknowledges the trouble one is about to cause and softens the request. Often followed by a request or question.
Sorry to bother you, but could you please fill out this form?
お手数ですが、もう一度メールを送っていただけませんか。
I'm sorry to trouble you, but could you send the email again?
A polite fixed phrase combining the honorific prefix お, the noun 手数 (trouble, effort), the copula です, and the conjunction が (but). The expression literally means 'It is trouble, but...' and is used to politely preface a request.