From Longman Dictionary of Contemporary Englishlook/search high and lowlook/search high and lowFINDto try to find someone or something by looking everywhere We looked high and low for Sandy but couldn’t find her. → high
Examples from the Corpus
look/search high and low• Throughout her letters, Clappe was searching high and low for a room of her own.• You say you have looked high and low for new building sites but let me tell you there are some.• We looked high and low for Sandy but couldn't find her.• He had searched high and low for these. 