To be oblivious to something that exists or is happening right around one. ("Blinders" are pieces of leather that are used to limit a horse's peripheral vision.) I must have blinders on when I walk around town because I didn't notice any of those new businesses that are opening.

To do something exceptionally well and with a great amount of skill. Primarily heard in UK. The whole team played well, but that new scrum-half really played a blinder out on the pitch! I have to say, for a newcomer in the political arena, the newly elected MP for Middlesborough played an absolute blinder this election.