In adverbial phrases (without article). full speed, with the utmost speed possible. (Cf. 8c.) Also attributive.

Phrases, etc. (a) topsails over (also simply topsail), head over heels, topsy-turvy. topsail walten, upside down. (b) with topsail, with topsails…

at the spur (also at spurs): = on the spur at sense 2c. Obsolete. rare.

on (also upon) the (†spursor) spur (also †upon spur), at full speed, in or with the utmost haste, in literal or figurative use.

At full speed. Now archaic and rare.

Of motion, etc.: swift, speedy, rapid. Also in a main pace (also speed): at full speed. Obsolete.

Phr. (from sense 1 or 2). full tilt (adverbial phr.): at full speed and with direct thrust; with utmost adverse force or impetus. Frequently in to ru…

Strain or tension of mental or bodily powers; strained exertion. (Figurative use of 1g.) Chiefly in… †at the full stretch (obsolete), upon full st…

at full tilt: at full speed; with maximum energy or force; at full capacity.

In various prepositional phrases. at (also †on) full speed, = 9b.

(at) full split, or like split, at full speed; as fast as possible. U.S.

U.S. colloquial phrase full chisel: at full speed, ‘full drive’.

(at) full pelt: as fast as possible, at full speed. Cf. full tilt at tilt, n.2 3c.

full swing (adverbial phr.): at full speed; with the utmost vigour or energy.

In the posture assumed (esp. in sporting prints) by a horse at full gallop; hence at full speed, ‘all out’. Also attributive.

With all possible effort; at full power, at top speed; using all one's strength or resources; = flat out, adv. 1.

dialect, colloquial, U.S., Australian, and New Zealand. A spurt at racing, a short brisk spin; a ‘spell’ of work. big licks = hard work. Also…

hell-for-leather: (a) adv. at breakneck speed, very fast, originally with reference to riding on horseback; (b) n. attributive very fast…

In a manner that involves using all one's energy or determination; fully, wholeheartedly. Esp. in to go all out: to do something as fast or…

colloquial. eyes out: = all out, adv. 4; esp. in to go eyes out (chiefly New Zealand and Australian). Cf. full tilt at tilt, n.2 3c.

Using or involving all one's (or its) strength or resources; at top speed; = all out, adv. 4. Also as adj.