The initial idioms of the letter P

prior	prior to
priority	prunes and prisms
private	private branch exchange
private eye	private message
privy	privilege
privy to	prize
prize above	pro
prob	Probablee
probe	probe for
probe into	problem
proceed against	proceed from
proceed with	proceed
process	proclaim (something) from the rooftops
Procrastination is the thief of time	Procrustean
Procrustean solution	procure