A toggle bolt, also known as a butterfly anchor, is a fastener for hanging things on hollow walls such as drywall. Toggle bolts have wings that open inside a hollow wall, bracing against it to hold the fastener securely. The wings are much larger than the bolt they are attached to. This spreads the weight of the secured item over a larger area, in...
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http://en.wikipedia.org/wiki/Toggle_bolt
A toggle-bolt is a kind of wall fastener for use on open-backed plaster boarding etc, having a part that springs open or turns through 90 degrees after it is inserted, so as to prevent withdrawal.
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http://www.probertencyclopaedia.com/browse/GT.HTM
noun a fastener consisting of a threaded bolt and a hinged spring-loaded toggle; used to fasten objects to hollow walls
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https://www.encyclo.co.uk/local/20974
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