jūbako; multi-tiered food box
Abbreviation of 重箱. Used in contexts where the full word is understood, such as in traditional cuisine or bento culture.
See also: 重箱
Osechi dishes are served packed in a jūbako.
Noun prefix used in compounds to indicate physical weight or heaviness.
The use of heavy weapons is restricted.
Noun prefix used in compounds to indicate severity, intensity, or seriousness.
I ruined my health from heavy labor.
重箱 is the full word for a multi-tiered lacquer food box, while 重 is its casual, abbreviated form used once the context is clear.
重（じゅう）is the counter used in modern Japanese for layers (二重, 三重), while 重（え）is the older reading found in the traditional hito-futa-mi numeral series and fixed words like 八重.
The kanji 重 carries meanings of 'heavy' and 'layer'. The reading じゅう is the on'yomi, used in compounds and counters.
strict; severe; stringent; rigorous
severe; serious; profound
important point; emphasis; priority · iteration mark (踊り字) · colon (punctuation)
unloaded weight; dead load; tare · one's own weight
serious injury; serious wound
load; loading; weight of a load
center of gravity · centroid; barycenter · balance; equilibrium
company director; executive; top management · important post; role with heavy responsibilities
instrumental ensemble
heavy machinery; heavy equipment · heavy machine gun
specific gravity; relative density · relative importance; weight; emphasis
profound; deep; grave; solid; dignified; stately; solemn; composed; substantial; massive
felony; serious crime
serious condition; critical condition
heavy labor; hard work · hard labor (in prison)
leading figure; authority; pillar
strong pressure; heavy pressure
baking soda; sodium bicarbonate
repeatedly; over and over again · fully; very much; exceedingly
reprint; additional printing; reissue
weighting; aggravation; increase in weight or burden