erect, straight, perpendicular; see upright 1, vertical.
fathom, explore, search; see measure 1.
"plumb." YourDictionary, n.d. Web. 28 May 2019. <https://thesaurus.yourdictionary.com/plumb>.
plumb. (n.d.). Retrieved May 28th, 2019, from https://thesaurus.yourdictionary.com/plumb
At right angles to the horizon or to level ground:
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