What is Understand ?
Understand is verb 1. to know what something means Don’t try to talk English to Mr Yoshida – he doesn’t un- derstand it. to make yourself understood to explain what you want, even if you don’t speak the language I hardly speak any Jap- anese, but I managed to make myself under- stood. 2. to have information, to think something is true because someone has told you so We understand that they’re getting married next month. It was understood that the group would meet at the pub. 3. to have sympathy for someone She’s a good teacher – she really understands children. 4. to know why something happens or how something works I can easily understand why his wife left him. I still don’t under- stand how to operate the new laser printer. (NOTE: understanding – understood )
source: Easier English, Student Dictionary Upper Intermediate Level