hollow back

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hol·low back

n. lordosis.
References in classic literature ?
About seven yards farther on he managed with difficulty to crawl up the incline on all fours, then he followed the edge of the hollow back to the place where the horse should have been.
McIlroy, also 21, shot a closing round 62 to destroy the field at Quail Hollow back in May, finished third in the last two Majors after shooting a 63 at St Andrews and then starred in the European Ryder Cup team.
Difficulty coming onto the bit, head tossing and hollow back are all signs of pain in the poll area often caused by the overuse of artificial aids.