take a long walk on a short pier

From the fact that if one walks longer than the walkway, one will find oneself falling into the body of water.

take a long walk on a short pier

1. (idiomatic, derogatory, colloquial) Used to tell someone to go away, or that their request will not be met.
   • 1952, Hospitals: the journal of the American Hospital Association, volume 26, page 40:

     Well, it was a busy day and I was really cut down to size — in fact, once I was told to take a long walk on a short pier.

   • 2001, Tad Crawford, The Money Mentor: A Tale of Finding Financial Freedom, page 183:

     She smiled, but she wasn't the same Tina who had told her banker dad to take a long walk on a short pier.

• get lost
• go jump in the lake