Question

what does the word cardboard signify

Answer 1

The word cardboard denotes the photograph pasted on a hard thick paper. This word has been used to refer to a practice in the past when photographs were pasted on cardboard and framed with glass front to preserve them.

Answer 2

The word 'cardboard' denotes the photograph.

This word has been used in order to convey that the photograph is old and wrinkled and that the clarity of the photograph is blur.