1. the process of gaining muscle mass and body weight, typically through exercise and increased caloric intake
Usage: fitness
2. the addition of inert material to increase volume or weight of a product
Usage: manufacturing

1. present participle of bulk; increasing in size or volume

Examples

• The athlete is bulking up for the upcoming season.
• He spent the winter months bulking to gain muscle mass.
• The company was caught bulking their products with cheap fillers.
• Her bulking phase lasted six months before she started cutting.
• The manufacturer was bulking the cereal with air to reduce costs.
• After bulking all summer, he increased his bench press significantly.
• The bulking agent helped improve the texture of the mixture.