Learner's definition of BULK
1
the bulk : most of something : the largest part of something主体；大部分 -
We spent the bulk of the summer at the beach.我们的夏季大部分是在海滩度过的。
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Farming makes up the bulk of the country's economy.农业构成了这个国家的经济主体。
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The great bulk of these people are extremely poor.这些人中的大多数都是一贫如洗。
2
[noncount] : the large size of someone or something大块头；大体积 -
Despite his bulk, he's a very fast runner.尽管他块头很大，但跑起来却很快。
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The sheer weight and bulk of the car makes it safe to drive. [=the car is safe because it is heavy and large]这辆车自重和体积都大，开起来很安全。
in bulk
: in large containers or in large amounts大包；大量；大批 2 bulk /ˈbʌlk/ adjective
Learner's definition of BULK
always used before a noun
: of or relating to things that are sent or sold in large amounts大量的；大批的；大宗的 -
bulk foods大批食物
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They sent bulk shipments of food to the country.他们往那个国家运送了大批食物。
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bulk prices/rates批发价；大宗商品价格
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bulk mailings/e-mail大宗邮件；群发电子邮件
3 bulk /ˈbʌlk/ verb
bulks; bulked; bulking
bulks; bulked; bulking
Learner's definition of BULK
bulk large
: to have great importance or influence很重要；很有影响力
bulk out
[phrasal verb] bulk out (something) or bulk (something) out
: to make (something) bigger or thicker by adding more material使加大；使加厚
bulk up
[phrasal verb] 1
: to gain weight often by becoming more muscular（常指因肌肉更加发达而）增加体重 2
a bulk (someone) up : to cause (someone) to gain weight使增加体重 b bulk up (something) or bulk (something) up : to make (something) bigger or thicker by adding more material使加大；使加厚