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plural abysses
[count]
: a hole so deep or a space so great that it cannot be measured
the ocean's abysses
I stood at the edge of the cliff and gazed down into the yawning/gaping abyss. [=chasm]
— often used figuratively
He says that there is a widening abyss between the rich and the poor.
She was pulled down into an abyss of despair.