-sə(r) noun
( -s )
: one that increases: as
a. : an agent that causes something to increase
these increasers of public turmoil
b. archaic : one that promotes or furthers something (as a cause, a group)
c. : a plant or animal that tends to multiply freely
several of the new glads proved to be excellent increasers
d. : a coupling for joining a pipe to another of larger diameter