{"era":"current","word":"unleash","meaning":"to free something from restraint or allow it to act with full force","children":[{"era":"pre-1100","word":"un-","meaning":"reversive prefix meaning \"not\" or \"reverse the action\"","children":[],"language":"Old English"},{"era":"1200s","word":"leash","meaning":"a tether or binding strap","children":[{"era":"1100s","word":"laisse","meaning":"a leash or tether","children":[{"era":"classical","word":"laxus","meaning":"loose, slack","children":[],"language":"Latin"}],"language":"Old French"}],"language":"Middle English"}],"language":"Modern English"}