bolster

【原文】
Several forces have inflated the bubble. On the fixed-income side, prices have been bolstered by Federal Reserve bond buying, making them vulnerable to a central-bank pullback. On the stock side, yield-hungry investors flooded high-dividend stocks, real-estate investment trusts and publicly traded master limited partnerships, among others.

【単語の意味（日本語）】
～を支持する；～を増す（強める）