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bulk

1 bulk /ˈbʌlk/ noun
1 bulk
/ˈbʌlk/
noun
Britannica Dictionary definition of BULK
the bulk : most of something : the largest part of something
[noncount] : the large size of someone or something

in bulk

: in large containers or in large amounts
2 bulk /ˈbʌlk/ adjective
2 bulk
/ˈbʌlk/
adjective
Britannica Dictionary definition of BULK
always used before a noun
: of or relating to things that are sent or sold in large amounts
3 bulk /ˈbʌlk/ verb
bulks; bulked; bulking
3 bulk
/ˈbʌlk/
verb
bulks; bulked; bulking
Britannica Dictionary definition of BULK

bulk large

: to have great importance or influence

bulk out

[phrasal verb]
bulk out (something) or bulk (something) out
: to make (something) bigger or thicker by adding more material

bulk up

[phrasal verb]
: to gain weight often by becoming more muscular
bulk (someone) up : to cause (someone) to gain weight
bulk up (something) or bulk (something) up : to make (something) bigger or thicker by adding more material