Senses
于/ 於 variants: 于 in
Indicates a location, scope, or time; equivalent to 在
于/ 於 variants: 于 towards
Indicates a direction, goal, or result
于/ 於 variants: 于 because of
Indicates a reason, cause, or purpose
于/ 於 variants: 于 than
Used after a word describing a quality to indicate comparison
于/ 於 variants: 于 by
Used after a verb to indicate the person or thing that performs an action in a passive sentence
于/ 於 variants: 於, 于 Yu
surname Yu (in Taiwan, often pronounced yū)
于/ 於 exclamation of admiration or grief
(archaic) An exclamation used to express admiration or grief; same as 乌
於 [sigh]
(literary) an exclamation expressing strong emotion; oh; ah