UNDERSTOOD (4 letters) Fully grasped is a term that can be used to describe a situation in which someone has a complete understanding of something. This can be achieved by knowing and understanding the details of a particular subject or concept. The crossword solutions for this term are KNEW and UNDERSTOOD, both of which have four letters. Knew is a verb that means to have knowledge or information about something, while UNDERSTOOD is a verb that means to comprehend or grasp the meaning of something. Together, these two words can be used to describe a situation in which someone has a full understanding of a particular subject or concept.