"siding" in the noun sense
1. siding, railroad siding, turnout, sidetrack
a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass
material applied to the outside of a building to make it weatherproof
"siding" in the verb sense
take sides for or against
"Who are you siding with?"
"I'm siding against the current candidate"
Source: WordNet® (An amazing lexical database of English)
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