One of the mysteries of the English language finally explained.
1Either of the two upright parts of a door frame; a doorpost.
2Building. Either of two posts supporting a roof at or towards one side of it; specifically = "queen post".
3Sport. Either of the two upright posts of a goal; = "goalpost".
Mid 16th century; earliest use found in Biblia: the Bible. From side + post.
side post/ˈsʌɪd pəʊst/
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