The initial idioms of the letter P

parental units	parentally challenged
park in	park it
park it somewhere	park
park that thought	park the bus
parker	Parkinson's law
parlay into	parley with
sauce parlor	parrot
parrot (someone's) words	parrot-fashion
thrust and parry	Fine words butter no parsnips
parson's nose	part and parcel
part company	part from
part hair	part over
part to play	part with
partake	partake in
partake of	partay