以至于

• Pinyin: yǐ zhì yú
• Hanzi breakdown: 以 = function word (by means of/to the extent of); 至 = 矢 + 一 (arrow + ground — an arrow reaching its target; to arrive/reach); 于 = preposition indicating location, direction, or degree

Meaning

So much so that; to the extent that; with the result that. A conjunction indicating that the preceding situation has reached such a degree that the following consequence naturally follows.

Introduces a result or consequence that is the extreme or logical outcome of what preceded it. Often implies unexpectedness, excessiveness, or intensity. Similar to 以致 (slightly more formal, usually negative outcomes) and 甚至 (even — less causal). Structure: [cause/degree] + 以至于 + [extreme result].

Examples

1. 他对这个课题的研究痴迷到以至于忘记了吃饭睡觉，连续三天泡在图书馆整理文献。 He became so obsessed with researching the topic that he forgot to eat and sleep, spending three straight days in the library organizing sources.
2. 连日暴雨导致河水暴涨，以至于下游数个村庄被迫紧急撤离，转移至高地临时安置点。 Days of heavy rain caused the river to surge, to the point that several downstream villages had to evacuate urgently and move to temporary shelters on higher ground.
3. 这个消息来得太过突然，以至于她站在原地愣了足足五分钟才缓过神来。 The news came so suddenly that she stood there frozen for a full five minutes before she snapped out of it.

Usage Guide

Context: narrative, journalism, academic, daily life

Tone: emphatic

Do Say

• 谈判拖了几个月，双方分歧大得以至于第三方代表多次宣布暂停磋商，过程一度有破裂风险。(The talks dragged on for months, and the two sides disagreed so sharply that the mediator repeatedly announced a pause in consultations, putting the process at risk of collapse.)
• 他埋首文献太久，以至于抬头时才发现图书馆灯已自动调暗，走廊里也早没了读者的声音。(He was buried in the literature for so long that when he looked up, he found the library lights had dimmed automatically and the corridor was already silent.)

Don't Say

• 他以至于很努力 — 以至于 introduces a result/consequence clause; it cannot precede an independent description of effort; use 因此、所以 for simple causal connections, or restructure to place 以至于 after a degree statement

Origin & History

以 (by means of/to the point of) + 至 (to reach/arrive — 矢 arrow pointing downward toward a target, meaning to arrive at) + 于 (at/to — a preposition marking a location or degree)

Cultural Context

Era: Modern

Generation: All ages

Social background: Universal