Causing or tending to cause constipation; something that blocks or slows down function.
The present participle of 'constipate,' formed by adding '-ing' to the verb. This creates both a verb form (the action of constraining) and an adjective (describing something that has this effect).
Foods like white rice and cheese are famous for being 'constipating'—the word perfectly describes anything that makes your system slow down or back up, whether physical or metaphorical!
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