/ˌʌndəˈstænd/verb[I, T](past tense and past participleunderstood)
KNOW MEANING›to know the meaning of something that someone says: I don't understand half of what he says.She didn't understand so I explained it again.I understand written French but I don't speak it very well.
KNOW WHY/HOW›to know why or how something happens or works: [+ question word]We still don't fully understand how the brain works.
KNOW FEELINGS›to know how someone feels or why they behave in a particular way: I don't understand James sometimes.[+ question word]I understand why she's so angry.
I/we understand (that)...formal›used to say that you believe something is true because someone has told you it is: I understand that the school is due to close next year.
make yourself understood›to say something to someone in a way that they understand: I had a little difficulty making myself understood.