Instead of taking the short cut along the Sound we went down the road and entered by the big postern.

from F. Scott Fitzgerald – The Great Gatsby (Chapter V) on Rap Genius

Meaning

A back or side entrance. The fact this is a “big” postern yet again emphasizes Gatsby’s wealth: even this trivial side door is extravagant.

Gatsby doesn’t take a short cut because he wants Daisy to see as much of land as she can so she’ll be impressed.

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