万年

まんねん ten thousand years; eternity

Why it means this

万 (ten thousand) + 年 (years) — ten thousand years; perpetually (万年雪, perennial snow; 万年筆, a fountain pen — 'ten-thousand-year brush'; 万年係長, forever stuck as a section chief).

Breakdown

万よろず ten thousand, 10,000
年とし year, counter for years

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