1rust 
/ˈrʌst/ noun
/ˈrʌst/ noun [noncount] 1 : a reddish substance that forms on iron or some other metal usually when it comes in contact with moisture or air
▪ an old pump covered in rust ▪ rust spots/patches 2 : a disease that causes plants to develop reddish-brown spots 3 : a reddish-brown color
▪ an old pump covered in rust ▪ rust spots/patches
