i.e., the broad and attractive road to destruction.
Compare to Matthew 7.13 (King James Version): "Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat."
Also see Shakespeare's All's Well that Ends Well:
I am a woodland fellow, sir, that always loved a
great fire; and the master I speak of ever keeps a
good fire. But, sure, he is the prince of the
world; let his nobility remain in's court. I am for
the house with the narrow gate, which I take to be
too little for pomp to enter: some that humble
themselves may; but the many will be too chill and
tender, and they'll be for the flowery way that
leads to the broad gate and the great fire. (4.5.40)
How to cite this article:
Mabillard, Amanda. Macbeth Glossary. Shakespeare Online. 20 Aug. 2000. (date when you accessed the information) < http://www.shakespeare-online.com/plays/macbeth/macbethglossary/macbeth1_1/macbethglos_primroseway.html >.