1. (用彩色纸片、布块粘贴而成的)拼贴画
A collage is a picture that has been made by sticking pieces of coloured paper and cloth onto paper.

2. 拼贴艺术
Collage is the method of making pictures by sticking pieces of coloured paper and cloth onto paper.

3. (风格、特性迥异的事物构成的)大杂烩
You can refer to something that has been made by combining a number of very different things as a collage of a particular kind.

1. a paste-up made by sticking together pieces of paper or photographs to form an artistic image

e.g. he used his computer to make a collage of pictures superimposed on a map

Synonym: montage

2. any collection of diverse things

e.g. a collage of memories