cram school, private school
塾 centers on a place of focused study outside regular school: a cram school or private academy where students receive extra instruction.
塾 combines 孰 (which historically relates to thoroughness or ripening) with 土 (earth/ground), suggesting a grounded place for thorough learning. The exact historical development is uncertain, but the phono-semantic structure is plausible.
The top 孰 looks like a person diligently studying, and the bottom 土 is the ground. Picture a student sitting on the ground at a private cram school, studying hard.
For ジュク, imagine a student at a cram school drinking a juku-juice (a made-up drink name) to stay awake: juku -> ジュク, and the juice fuels the late-night study session.
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cram school; private tutoring school; juku
Keio (Private University)
cram school student; student of a private-tutoring school
principal of a private school
enrolling at a cram school
Keio University
small private school (esp. for cramming)
lunch box brought to cram school; cram school lunch box
cram school building
cram school teacher; teaching at a cram school
cram school teacher
attending cram school
principal of a cram school
cram school; private tutoring school
government-backed school operated by a scholar out of his home
Keio Economic Observatory; KEO
The Matsushita Institute of Government and Management
Tsuda College
private painting school
charity school; charitable school