Color symbolism is the use of color as a representation or meaning of something that is usually specific to a particular culture or society. Context, culture and time are certainly important factors to consider when thinking about color symbolism.
Definition of backpack for English Language Learners. : a bag for carrying things that has two shoulder straps and is carried on the back.
countable noun. 1  A satchel is a bag with a long strap that schoolchildren use for carrying books. 2  a rectangular bag, usually made of leather or cloth and provided with a shoulder strap, used for carrying books, esp school books. 3  a small bag for carrying clothes, books, etc., sometimes having a shoulder strap.