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The definition of mainstay

2 Definitions of: mainstay

1. noun, nautical the forestay that braces the mainmast
2. noun, a chief support
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4. Show me the etymology of the word: mainstay

Synonyms:	pillar, backbone, bulwark, prop, anchor, buttress, linchpin

From Collins

©HarperCollins 2008. Collins English Dictionary definition of mainstay