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 contribute to / to promote
willing (to do sth) / to take pleasure in
to belong to / affiliated to / to result in sth / to incline towards
in view of this / to this end
to be advantageous to; to be beneficial for
to be advantageous to / to be beneficial for
violent death (idiom); to die in a disaster / an unnatural death
very likely / prone to
second after / second only to
see 有賴|有赖[you3 lai4]
to be distracted from one's work and fail to achieve results (idiom)
mastery of study lies in diligence (idiom). You can only master a subject by assiduous study. / Excellence in work is only possible with diligence. / Practice makes perfect.
to be rooted to / to take root in
lit. dip one's finger in the tripod (idiom); fig. to get one's finger in the pie / to get a share of the action
see 生於憂患,死於安樂|生于忧患,死于安乐[sheng1 yu2 you1 huan4 , si3 yu2 an1 le4]
see 易如反掌[yi4 ru2 fan3 zhang3]

Sentences with 于

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