u/9SpearsOfDominion

Why isn't there an s after measurements like "pound" and "year" sometimes

I hear phrasings like "three year ago" and "that cost me seven pound" from British media a lot, particularly from Scotland, but I recently came across a passage from Blood Meridian where they say "two year ago there were a lot of buffalo". Is this a colloquialism or an anachronism? And what is its origin? Does it follow the same rules as measuring statements like "ten-ton brick" or "five-year-old"?

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u/9SpearsOfDominion — 22 hours ago