The moon was fuller than the night before, but the light was diffused by cloud.

月亮比头一天晚上更圆，但因云层遮掩而月光朦胧。

《牛津词典》

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"The old moon in the new moon's arms" is nothing but that part of the moon's surface on which it is night, lighted up by earth light.

新月抱旧月“只不过就是月球表面上正处于黑夜的那一部分被地球的反射光反照的结果。”

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And then we let the Lake Placid Lodge do what it does best: another fine meal, another gibbous moon, another night to sleep by the light of the fireplace.

FORBES: Magazine Article