to go / to take / sentence-final interrogative particle / variant of 於|于[yu2]
(of time or place) in; at; on / (indicating any indirect relation) to; toward; vis-à-vis; with regard to; for / (indicating a source) from; out of / (used in comparison) than / (used in the passive voice) by

= + : Mnemonic symbol: prepositions (in, at, on, to, ...) are what glue the sentence together. Honey is as sticky as glue, so I'll represent 于 by a honey jar.

Yu the Great (于) was assigned to repair the electronics of the space station's kitchen (Ø2), but instead he was snacking honey from a honey jar (于). Unfortunately his capacitor (二) got stuck in the honey and now he has to use a crowbar (亅) to lever it out.

于 character breakdown

"vertical stroke with hook" radical in Chinese characters (Kangxi radical 6) / see also 豎鉤|竖钩[shu4 gou1]

Mnemonic symbol: 亅 looks like a crowbar. Zeus (ju) is bored and presses all the buttons next to the elevator kitchen's (e2) door with his crowbar (亅).
two / 2 / (Beijing dialect) stupid

= : Mnemonic symbol: a capacitor, because the two strokes remind me of the symbol in electrical drawings. Albert Einstein (Ø) is experimenting with a capacitor (二) in the space station's bathroom (Ø4). He finds that it's uncomfortable to discharge a capacitor using two flutes (一).

Characters with 于 as component

variant of 籲|吁[yu4]
sh / hush
to implore

= + : Yu the Great (yu) wants to stick a mandarin (口) into a honey jar (于) and eat it, but in the space station's bathroom (Ø4) the mandarin is imploring (吁) him to not do it.
room / universe

= + : Yu the Great (yu) just earned her PhD in the space station (Ø3) and is proudly putting on her graduation cap (宀). She was measuring cosmic (宇) rays by investigating the traces they left in a honey jar (于) and is demonstrating her experiment for the camera.
taro / Colocasia antiquorum / Colocasia esculenta
(dialect) country fair / country market
dike
variant of 污 / dirty / filthy / foul / corrupt / to smear / to defile / dirt / filth
basin / wide-mouthed jar or pot
literal-minded / pedantic / doctrinaire / longwinded / circuitous
surname Xu

Words with 于

to be in / to lie in / to consist in / to depend on / to rest with
because of / on the basis of / in view of / on account of
to be beneficial / to be good for
to dare to / to be brave enough to
to die in such a way that sb (or sth) else also perishes / to take sb down with oneself / to end in mutual destruction
face light up with delight (idiom); to beam with joy
to tally / to accord with / to fit
in keeping with the current thinking; appropriate for the times (or for the occasion)
lit. an ant hole may cause the collapse of a great dike (idiom) / fig. huge damage may result from a moment's negligence
to be emperor by the grace of heaven; to have the mandate of heaven
nothing sadder than a withered heart (idiom attributed to Confucius by Zhuangzi 莊子|庄子[Zhuang1 zi3]) / no greater sorrow than a heart that never rejoices / the worst sorrow is not as bad as an uncaring heart / nothing is more wretched than apathy
lit. to ask a blind man the way (idiom) / fig. to seek advice from an incompetent
chanyu (Han Dynasty name for chiefs of Xiongnu Huns 匈奴[Xiong1 nu2])
lit. a thousand mile journey begins with the first step / fig. big accomplishments come from an accumulation of little achievements made one by one
an ant hole may cause the collapse of a great dike (idiom) / huge damage may result from a moment's negligence

Sentences with 于

yú
nǐ
men
zhè
hua̅
guǒ
sha̅n
kě
shì
dà
bù
xia̅ng
tóng
a