{"era":"current","word":"nightlife","meaning":"social activities at night","children":[{"era":"early 20th C","word":"night + life","meaning":"activities during night","children":[{"era":"pre-1100","word":"night","meaning":"period of darkness","children":[{"era":"pre-2000 BCE","word":"*nokʷt-","meaning":"night","children":[],"language":"Proto-Indo-European"}],"language":"Old English"},{"era":"pre-1100","word":"life","meaning":"state of being alive","children":[{"era":"pre-2000 BCE","word":"*leip-","meaning":"to cling, adhere","children":[],"language":"Proto-Indo-European"}],"language":"Old English"}],"language":"Modern English"}],"language":"Modern English"}