Final answer:
Phoebe cuts off communication with Holden in two ways: refusing to meet him at lunch and not responding to his phone calls.
Step-by-step explanation:
In J.D. Salinger's novel 'The Catcher in the Rye,' Phoebe cuts off communication with Holden Caulfield in two ways: One, she refuses to meet him at lunch and two, she stops responding to his phone calls. Phoebe's actions symbolize her frustration with Holden's behavior and her attempt to establish her own boundaries.