{"era":"current","word":"lifeguard","meaning":"a person trained to watch swimmers and rescue people from drowning","children":[{"era":"pre-1100","word":"life","meaning":"living existence","children":[{"era":"pre-1100","word":"Proto-Germanic *libam","meaning":"life, body","children":[],"language":"Proto-Germanic"}],"language":"Old English"},{"era":"1200s","word":"guard","meaning":"to protect or watch over","children":[{"era":"1200s","word":"Old French garder","meaning":"to guard, keep","children":[{"era":"pre-1100","word":"Germanic *wardōn","meaning":"to watch","children":[],"language":"Proto-Germanic"}],"language":"Old French"}],"language":"Middle English"}],"language":"Modern English"}