bolsterer

bolster +‎ -er

bolsterer (plural bolsterers)

1. One who, or that which, bolsters.
   • 1944, The Lamp, volumes 26-30, page 53:

     When canned foods pall, a rifle is a handy bolsterer of the meat supply in this land of wild game; when, in the lonely night, the two geologists have talked through every subject in their ken, a book lumined by a gasoline lamp is a real diversion.

• lobsterer, rebolster, rebolters