To be related to or connected with something; to belong to or be a part of something.
From Latin 'pertinere,' combining 'per-' (through) and 'tenere' (to hold). Literally meant 'to hold through' or 'extend to.' The meaning shifted to 'relate to' or 'concern' in Middle English.
When you say 'that doesn't pertain to me,' you're using a word that comes from Latin and literally means 'doesn't extend to me'—it's a concise way of saying 'that's not my business or responsibility'!
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