Armpiece

“Go, my good St. John,—in an arm-piece of the Milanese armor that hangs on the wall, thou’lt find the Seal!”

He'd decided to take her because she was the best looking armpiece of all, and as long as she kept her mouth shut, he'd be the envy of every man there.

Years of being his armpiece have taught her exactly how to handle this situation; she is suddenly sure of it.

Madeline was in on the routine, and shortly after Louise exited, the swain and his armpiece departed for their outing to Little's Music Shop.