Definition of "attach to" [attach to]

• Be present or associated with an event or entity (verb)
• Be part of (verb)

WordNet. Princeton University. 2010.

• "As consumer researcher Russell Belk observed, we cannot hope to understand consumer behavior without first gaining some understanding of the meanings that consumers attach to possessions."
• "When you have finished your letter complaining about this book, place it in an air-mail envelope, and attach to it the appropriate postage."
• "These self-reactive T cells stimulate other immune cells to produce autoantibodies that attach to the perfectly fine, healthy cells within our body—in any organ or tissue—and cause cells to die."