The term 'fill plentifully' can be defined as to fill something with an abundance of material. This phrase is often used when referring to a container, such as a bowl or cup, being filled with a substance, such as water or food. It can also be used to describe a situation in which something is filled with a large amount of something else, such as a room being filled with people or a field being filled with crops. The crossword solution for this term is LINE, which can refer to a LINE of people, a LINE of text, or a LINE of objects.