From Longman Dictionary of Contemporary English(not) know the meaning of something(not) know the meaning of somethingUNDERSTANDto have, or not have, experience and understanding of a particular situation or feeling Living in a war zone, the children knew the meaning of fear. Guilty! She doesn’t know the meaning of the word! → meaning
Examples from the Corpus
(not) know the meaning of something• A dictionary is useless unless one already knows the meanings of many words.• He had a lot of things representing other things that no one but he knew the meaning of.• So I know the meaning of credit.• Some were struggling behind-but they did not really know the meaning of struggling.• Men like Luke Hunter didn't know the meaning of permanence - or fidelity.• Mike Hardware was the kind of private eye who didn't know the meaning of fear.• Willi didn't know the meaning of restraint, not in any aspect of his life.• For instance, we assume he would satisfy our behavioural criteria for being some one who knows the meaning of the word bank.• Regarding exercises: before attempting to answer a question do make sure you know the meaning of all the words in it! 