I. 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
II. bolster 2 BrE AmE noun [countable]
[ Language: Old English ]
a long firm ↑ pillow , usually shaped like a tube