Dabblin bar

• Dublin Bar: a sandbar at the mouth of the Liffey which could only be navigated at high tide; the construction of the North and South Walls led to its dispersal
  • A Finnegans Wake Gazetteer
  • Ulysses 049.27: "High water at Dublin bar"

• Dublin bar → i.e. a Dublin pub or inn, like HCE's tavern

• dabbling: (1) spattering with moisture; (2) doing something in a trifling or small way

• bar: (slang) £1 sterling