A stanchion is a post or rod used to support something. Stanchions hold things up.

You can almost see the word stand in stanchion, and that should help you remember what it means. A stanchion stands straight up, and it supports a larger structure. In just about any building, you will see posts going from the floor to the ceiling: those are stanchions. Stanchions are part of many walls too. If you took the stanchions out, the building might fall down. Stanchions always go up and down; they're vertical and provide support.

Definitions of stanchion
  1. noun
    any vertical post or rod used as a support
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    type of:
    an upright consisting of a piece of timber or metal fixed firmly in an upright position
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