Hourglass contraction

What is Hourglass contraction?

Hourglass contraction definition and meaning on Dictionary terms:
noun
a small common finch, Carpodacus mexicanus, originally of the western U.S. and Mexico and now widely distributed: the males have a red forehead, throat, breast, and rump.

 

reference: www.dictionary.com/browse/hourglass-contraction

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