From Longman Dictionary of Contemporary Englishat first blushat first blushliteraryFIRST when first thought of or considered At first blush, this sounds like good news. → blush
Examples from the Corpus
at first blush• At first blush, this discovery seems to confirm his theory.• A.. The results here sound more grim at first blush than they really are.• That may sound strange at first blush. 