a small amount or touch of something, or a slight irritation or annoyance (British informal).
Possibly a dialectal variant of 'tint' or from 'touch,' used in British English particularly in the phrase 'a tetch of.' The origin is uncertain but suggests a tiny quantity.
This is a regional British word that's practically disappeared from modern usage—it's the kind of word you'd hear in older British novels but rarely in conversation, making it a linguistic fossil.
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