In a rallying manner; moving or acting with renewed energy or enthusiasm toward a common cause or goal.
From 'rally' (to gather again, from French 're-' and 'allier' meaning to ally), plus '-ly' adverb suffix. This is a less common variant of 'rallying-like' behavior.
This is a rare adverb that combines the energy of 'rally' (gathering strength) with the '-ly' adverbial form, creating a word most English speakers have never encountered because we usually say 'with renewed vigor' instead.
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