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

due to / to stem from
to be located at / to be situated at / to lie
down to / up to / to the extent that...
to be lower than
between / intermediate / to lie between
to be saved from / to be spared (something)
easy to / convenient for
second only to ...; ranking behind only ...
to announce to the world (idiom) / to make public / to let everyone know
to incline to / to prefer / to be prone to
internal disunity dissolves at the threat of an invasion from outside (idiom)
to be on the horns of a dilemma (idiom)
(idiom) to announce to the world; to make public; to let everyone know
to make known to the masses (idiom); to publicize widely / to let the world know
so that / to the point that
for the sake of / in order to
of what use is it / (idiom)

Sentences with 于

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