One of the mysteries of the English language finally explained.
with object To produce or develop (greatly) by labour; to enlarge upon.
Mid 17th century; earliest use found in Thomas Blount (1618–1679), antiquary and lexicographer. From classical Latin allabōrāt-, past participial stem of allabōrāre to make a special effort, to add to by taking trouble from al-, variant of ad- + labōrāre.
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