趋于
qūyū · HSK 7
tend
📈 趋 = hasten toward + 于 = toward/at marker = to tend toward
趋 means to hasten or lean in a direction; 于 is a preposition meaning toward or at. Together 趋于 marks a trend settling toward some state, like numbers that tend toward zero.
于 — two horizontal strokes 二 + vertical hook 亅
于 originated as a pictograph of breath or sound flowing outward, depicting exhalation through a passage. In oracle bone script it resembled a curved line showing motion or extension. Over time it became a grammatical preposition meaning 'at,' 'in,' or 'to,' losing its original concrete sense.