at the top of one's speed

adverb

Roget 274: swiftly etc. adj.; with speed etc. n.; apace; at a great rate, at full speed, at railway speed; full drive, full gallop; posthaste, in full sail, tantivy^†; trippingly; instantaneously etc. 113.    under press of sail, under press of canvas, under press of sail and steam; velis et remis [Lat.], on eagle's wing, in double quick time; with rapid strides, with giant strides; a pas de geant [Fr.]; in seven league boots; whip and spur; ventre a terre [Fr.]; as fast as one's legs will carry one, as fast as one's heels will carry one; as fast as one can lay legs to the ground, at the top of one's speed; by leaps and bounds; with haste etc. 684.    ... show more

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