From Longman Dictionary of Contemporary Englishwhile you’re about itwhile you’re about itspoken used to tell someone to do something while they are doing something else because it would be easier to do both things at the same time Go and see what’s the matter, and while you’re about it you can fetch me my sweater. → about
Examples from the Corpus
while you’re about it• Er, he said, while we 're about it, you couldn't lend me your bass as well, could you? 