“They had been double-crossed in the act of double-crossing, which was probably what they should have expected from the start, especially knowing that the dead man at their feet was an American.”

“And if he is lying and he double-crosses you, I’ll kill him for you.” From anyone else, it would have been an idle threat, and I smiled, feeling loved.(Ivy and Rachel)”

“You bring up your children to be self-reliant and independent and they double-cross you and become self-reliant and independent.”

“That evening, getting up from the table, she had crossed the invisible boundary beyond which things start working by themselves.”

“She glanced rapidly between them, blinking and hoping her double vision would go away. They were glaring at each other. Would they fight? If she saw her own double she probably be tempted to punch it once or twice. Especially today. For being so stupid.”

“Muggles have garden gnomes, too, you know," Harry told Ron as they crossed the lawn."Yeah, I've seen those things they think are gnomes," said Ron, bent double with his head in a peony bush, "like fat little Santa Clauses with fishing rods...”