clue
[noun]
a piece of evidence that leads someone toward the solution of a crime or problem
off the top of one's head
[phrase]
from one's memory, without spending time to carefully consider or think
to hear of
[verb]
to know about somebody or something because one has received information or news about them
to know sth like the back of one's hand
[phrase]
to be well-informed about or completely familiar with something
positive
[adjective]
(of a person) completely sure about the truth or correctness of something
to know sb/sth inside out
[phrase]
to have very good knowledge or understanding about someone or something
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