it was obvious that i could not remember the new student's name, my face wearing the tell-tale acquaintenance of a poor memory
a facial expression showing slight confusion, often accompanied by a furrowed brow, brought on when meeting someone for the second-or-third time, before you can remember their name
"it was obvious that i could not remember the new student's name, my face wearing the tell-tale acquaintenance of a poor memory" What is the definition of "acquaintenance"?