Definitions

1. noun

a device or machine that increases the size or capacity of something, such as a gas tank or a storage container

“The car’s fuel tank was fitted with an expander to increase its capacity.”

2. verb

to increase the size or capacity of something, such as a gas tank or a storage container

“The engineer decided to expand the storage room by installing an expander.”

3. noun

a type of dental appliance that is used to widen the jaw or expand the palate

“The orthodontist recommended an expander to her patient to help widen their jaw.”

4. noun

a person or device that expands or increases something, such as a social movement or a business

“The activist was seen as an expander of the social movement, mobilizing people to take action.”