send (one) below
To send an officer or crew member to some section of a ship below the deck. I sent the boatswain below to inform the captain of the news.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
send someone below
to send someone to one of the lower decks of a ship. The first mate sent the sailor below to shovel coal into the boiler. The captain sent Mr. Wallace below, where he would be out of the way during the storm.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.