The phrase "to make a banner" means creating a large, usually rectangular, sign with words or images on it, typically used for displaying messages or advertisements in a public space. Full definition
My daughter's birthday is in a couple weeks and would love to make this banner for her cake. (rainonatinroof.com)
Many teachers spend hours of time cutting out large display letters or making a banner on their own at home on their computers. (uniqueteachingresources.com)
Many teachers spend hours of time cutting out large display letters or making a banner at home on their computers. (uniqueteachingresources.com)