bolster¹

ˈbəʊlstə/

verb

gerund or present participle: bolstering

1. 1.

   support or strengthen.

   "the fall in interest rates is starting to bolster confidence"

   synonyms:

   strengthen, support, reinforce, make stronger, boost, fortify, give a boost to; More
2. 2.

   provide (a seat) with padded support.

   "I snuggled down into the heavily bolstered seat"