If you are emboldened by something, it makes you feel confident enough to behave in a particular way.
例句
The Prime Minister was steadily emboldened by the discovery that he faced no opposition...发现自己并未遭到反对，首相渐渐有了信心。Four days of non-stop demonstrations have emboldened the anti-government protesters.持续4天不间断的示威使反政府抗议者士气高涨。