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to no longer have recent knowledge or information about something
to not know anything about a subject or not have the skills to do something
to be unable to imagine what something is like because you have never experienced it
to not know the most recent information about something, so that you no longer understand it completely
to not know or understand something
to not have enough knowledge to give an opinion about something
to not find out that something has happened, especially something bad
if something passes you by, you do not notice it
to be unable to answer a question, especially in a test
to not realize something
in an online conversation, repeatedly asking a person questions which suggest that you are interested in what they are talking about, but are actually intended to annoy them
a soft fruit that has a green skin and a large hard seed inside. It grows on a tree and is a type...
an electric skateboard
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Free thesaurus definition of to not know something or someone from the Macmillan English Dictionary - a free English dictionary online with thesaurus and with pronunciation from Macmillan Publishers Limited.