B1
to connect or fix one thing to another
Dictionary examples:
She attached a 'Do Not Disturb' sign to her forehead during exams. (0.0)
He attached wheels to his bed. Now he can race to breakfast! (0.0)
He attached his keys to a boomerang. They always come back! (0.0)
I attached a photo to my application form. (26.3)
Use this cable to attach the printer to the computer. (27.5)