pad, support, bolster up, long pillow, headstead, cushion, husband, Dutch wife, buttress, bombast, more...

undermine, weaken, compromise, sabotage

feather, down, feather and down, down and feather, more...

small, long, large, round, hard, front, external, internal, white, soft, old

shore up or support,   long pillow on bed,   fancy pillow,   build confidence,   give strength to,   boost confidence,   give strength,   pocketknife handle,   build up confidence,   big pillow