Question

Meaning of unswept stone

Answer 1

Than unswept stone be sm e ar'd with slu tt ish time. You probably came into this as su min g it was a lov e poem, but we don't sight the beloved object until line 3 when "you" sails into the picture with no further introduction.

Answer 2

Unswept means unkempt stone monument ,i.e., untidy stone monument.