Originally: a hand-operated mechanical device for laying an underground pipe by pushing it through the ground from one pit to the next; (later also) a hydraulically-operated machine performing this function.
Origin
Early 20th century. From pipe + Jack.
Definition of pipe jack in US English:
pipe jack
nounˈpʌɪp dʒak
Engineering
Originally: a hand-operated mechanical device for laying an underground pipe by pushing it through the ground from one pit to the next; (later also) a hydraulically-operated machine performing this function.