{"era":"current","word":"meltdown","meaning":"collapse or uncontrolled overheating and melting","children":[{"era":"Old English","word":"melt","meaning":"to become liquid by heat","children":[{"era":"pre-1100","word":"meltan","meaning":"to melt","children":[{"era":"prehistoric","word":"*mel-","meaning":"to crush, grind, or wear away","children":[],"language":"Proto-Indo-European"}],"language":"Old English"}],"language":"English"},{"era":"Old English","word":"down","meaning":"particle indicating downward movement or completion","children":[],"language":"English"}],"language":"Modern English"}