誓約{せいやく}を守るmake a pledge in one's inaugural address: 就任演説{しゅうにん えんぜつ}で誓うmake good on one's promise: 約束{やくそく}を守る、有言実行{ゆうげん じっこう}するmake good on one's word: 約束を守る[果たす]