bol ‧ ster 1 /ˈbəʊlstə $ ˈboʊlstər/ BrE AmE ( also bolster up ) verb [transitive]
1 . to help someone to feel better and more positive SYN boost :
He is making a bold attempt to bolster the territory’s confidence.
2 . to improve something SYN boost :
his efforts to bolster his career