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[countable noun]a subject or problem that is often discussed or argued about, especially a social or political matter that affects the interests of a lot of people
the information, skills, and understanding that you have gained through learning or experience
You need specialist knowledge to do this job.
He did nothavemuch knowledgeof American history.
waste matter from animals that is mixed with soil to improve the soil and help plants grow
to treat a person or animal badly, especially in a cruel way [= ill-treat, maltreat]:
Security forces are accused of mistreating prisoners.