what does "on the landing"mean?
“Your tea,” she said, indicating a steaming mug.
“Great, thanks. Just give me a moment,” he said, and he left to pee in the bathroom on the landing. As he zipped up his fly, he caught sight of himself in the mirror, crumpled-looking and unshaven. Not for the first time, he consoled himself that his hair looked the same whether brushed or unbrushed.

Question

Answer

"The bathroom on the landing" refers to the bathroom which has it's doorway opening off the landing or flat area at the top or bottom of a flight of stairs.

Definition of landing - a noun - 'a level area at the top of a staircase or between one flight of stairs and another, as in "he ran across the landing to his bedroom"'

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