I think it basically means "or something." It's 일(which is like 것 in this case) + (이)라도 (which is a particle that indicates there are other options.) Ex) 무슨 일이라도 했어요? Did (a thing or) something happen? Ex) 제가 무슨 실수라도 했어요? Did I make a mistake (or something?) I recommend this lesson which explains this in detail. Check out the PDF especially. : ) http://www.talktomeinkorean.com/lessons/level-5-lesson-15/

it can mean various things depending on your context. 라도 could mean "even" or "any". you are missing a very important clue to this. 일 does not appear by itself. it has to be preceded by ㄴ,은, or ㄹ because 일 does not really mean anything concrete it is like 것 which is used to fulfil structural requirement. when posing question in korean language, it is advisable to put in complete sentence. The language allows such diverse interpretation without contextual aid.