Notes on Act III, scene vii

Post: hurry

festinate: speedy

preparation: against France

posts: messengers

questrists: pursuers

pinion: tie him up

pass upon: pass a sentence upon 

do a courtesy: defer to

corky: withered with age

quicken: come alive

hospitable favours: the face of your host

footed: landed

guessingly: tentatively, not certain of the facts

opposed: against England

buoy'd: risen

stelled: starry (if the sea were like the storm he endured, it would have put out the stars)

holp: helped

cruels: all other cruel creatures would yield to feelings of compassion under such conditions, except yourself

winged: heavenly, swift

mock: the eyeless socket will make the healthy one look ridiculous because they don't match 

shake: an insult said to Regan, similar to Regan's plucking at Gloucester's beard

nature: natural feelings

quit: requite, avenge

apace: swiftly

meet the old course of death: dies naturally of old age