計る
はかる · hakaru · JLPT N3 · verb-godan
to measure
📏⚖️ 計 = 言 words + 十 ten: counting out loud in tens is how you measure
計 combines 言 (speech) with 十 (ten), so its core sense is to count or calculate. As a verb, 計る means measuring something by counting it, as in 時間を計る (to time something). Hakaru sounds a bit like 'hack a ruler'.