Dictionary bolsterStrengthen or support

verb

bolster

BOHL-ster/ˈbəʊlstər/

To support, strengthen, or reinforce something.

The diagonal brace will bolster the shelving frame.

A worker attaches a diagonal wooden brace to a shelving frame.

Etymology

bolsterOld Englishcushion or stuffed pillow

To prop someone with a cushion broadened into supporting or strengthening anything.

More examples

The evidence helps bolster her argument.
Extra volunteers will bolster the rescue effort.

Forms

bolster

Similar words

reinforce: Often means adding material or support to increase strength.
support: Can mean sustaining something without making it stronger.