What is another word for look high and low?
Pronunciation: [lˈʊk hˈa͡ɪ and lˈə͡ʊ] (IPA) 
When searching for something, one can 'look high and low' in every nook and cranny, every corner, and every possible location. There are many other ways to express the same idea. One can say 'turn over every stone' or 'leave no stone unturned' to indicate an exhaustive effort. 'Scavenge' and 'rummage' are synonyms which refer to a more intense search. 'Peruse' suggests a more thorough and detailed search. 'Examine' can be used to indicate a deliberate look at each item, while 'scan' has a connotation of quick and superficial search. The most accurate synonym is 'search thoroughly', which indicates a complete and exhaustive search.
