暗暗发誓
Swear secretly
以上为机器翻译结果，长、整句建议使用 人工翻译 。
他暗暗发誓要为牺牲的同志报仇。
He vowed to himself to avenge his martyred comrade.
《新英汉大辞典》
我曾暗暗发誓，我永远都不会再哭。
I once promised myself that I wouldn't cry anymore.
youdao
从此我暗暗发誓一定要成为一个素食主义者。
I vowed within myself to be a vegetarian.
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