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To not know something or someone

pass

verb

to be unable to answer a question, especially in a test

lose touch (with something)

to not know the most recent information about something, so that you no longer understand it completely

be out of touch (with something)

to no longer have recent knowledge or information about something

not know the first thing/not have the first idea about something

to not know anything about a subject or not have the skills to do something

have no concept of something

to be unable to imagine what something is like because you have never experienced it

pass by

if something passes you by, you do not notice it

not have a clue

to not know or understand something

be no judge (of something)

to not have enough knowledge to give an opinion about something

not be any the wiser

to not find out that something has happened, especially something bad

not know beans about something

to know nothing about a subject

hostile architecture

the design of buildings or public spaces in a way which discourages people from touching, climbing or sitting on them …

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boots on the ground

a situation in which a country's armed forces are physically present in an area of conflict …

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