backstay

noun
back·stay | \ˈbak-ˌstā \

Definition of backstay 

1 : a stay extending aft from a masthead

2 : a strengthening or supporting device at the back (as of a carriage or a shoe)

First Known Use of backstay

1626, in the meaning defined at sense 1

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The first known use of backstay was in 1626

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