Chris Evans endured months of nausea-inducing workouts to bulk up for Captain America: The First Avenger.
In recent months, Cameron has sought to bulk up his shadow cabinet.
Also, he lifted weights with his teeth to bulk up his neck and trapezius muscles.
Wells's clerks, Bennett's "cards" and even Conrad's Russian villains do not "bulk up" against them.
Mother Corey heaved his bulk up slowly, wheezing, and indicated his chair at the head of the table.
He put his quill down and started to heave his bulk up from his chair.
He sprang to his feet, found Grim heaving his bulk up more slowly.
mid-15c., "a heap," earlier "ship's cargo" (mid-14c.), from a Scandinavian source akin to Old Norse bulki "a heap; ship's cargo," thus "goods loaded loose" (perhaps literally "rolled-up load"), from Proto-Germanic *bul-, from PIE root *bhel- (2) "to blow, inflate, swell" (see bole).
Meaning extended by confusion with obsolete bouk "belly" (from Old English buc "body, belly," from Proto-Germanic *bukaz; see bucket), which led to sense of "size," first attested mid-15c.
"swell, become more massive," 1550s (usually with up), from bulk (n.). Related: Bulked; bulking.