One of the mysteries of the English language finally explained.
Definition of overjump in English:
overjump
verb
1with object To jump over (a thing). Now chiefly figurative: to transcend, overleap. Also (occasionally) without object.
2with object And without object. Especially of a horse: to jump too far or too high over (a fence, etc.). Also with object (refl.): to jump further than one's strength allows.
Origin
Early 17th century; earliest use found in John Marston (bap. 1576, d. 1634), poet and playwright. From over- + jump.