earth

  

 earth

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to make electrical equipment safe by connecting it to the ground with a wire = ground  

Make sure that the machine is properly earthed  

down-to-earth 

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practical and direct in a sensible honest way  

Fran's a friendly, down-to-earth person 

a chef with a down-to-earth approach to cooking 

   earth mother  

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a woman who has all the qualities expected of a mother and is especially interested in simple, natural ways of living 

Mother Earth  

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the world, considered as the place or thing from which all life comes

earth-shattering   

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surprising or shocking and very important 

an earth-shattering event