From Longman Dictionary of Contemporary Englishrun a milerun a mileinformalAVOID to try very hard to avoid a particular situation or person because you do not want to deal with them If someone asked me to marry them, I’d probably run a mile. → run
Examples from the Corpus
run a mile• If anyone had told her then that one day she would join the royal family she would have run a mile.• You could run a mile, but you're too disciplined and responsible for that.• Could you walk two miles in thirty minutes or run a mile in ten or twelve minutes?• And though injured himself he ran a mile over rough terrain to fetch help.• Luke Hunter would probably run a mile rather than meet her again. 