The term 'At Full Gallop' is a phrase that describes a horse running at its fastest speed. The two crossword solutions for this term are 'Tantivy' (7 letters) and 'APACE' (5 letters). 'Tantivy' is an old English word meaning 'at full gallop' and is derived from the French word 'tant-va-vite', which translates to 'so fast'. 'APACE' is an adverb meaning 'QUICKLY' or 'at a fast pace'. Both words can be used to describe a horse running at its fastest speed.