From Longman Dictionary of Contemporary English(right) under somebody’s nose(right) under somebody’s nosea) if something bad or illegal happens under someone’s nose, they do not notice it even though it is happening very close to them and they should have noticed it The drugs were smuggled in right under the noses of the security guards. b) if something is right under someone’s nose, they cannot see it even though it is very close to them The key was right under my nose all the time. → nose
Examples from the Corpus
(right) under somebody’s nose• Pat's car was stolen, almost from under his nose. 