plural of watering hole attack

(mathematics, physics) A mathematical formulation for a black hole which does not contain a singularity. The environment outside the event horizon is the same as other formulations for black holes.

plural of primordial black hole

A black hole which is formed by direct collapse of primordial gas and dark matter, before the first stars ever formed, in a Big Bang universe.

Alternative form of dig oneself in a hole

(informal) to create a situation that is difficult to get out of.

plural of hole-board test

A scientific method of measuring anxiety, stress, neophilia and emotionality in animals, involving an enclosed area with a floor covered in holes that the animal may or may not choose to explore.

A town in Hetton parish, Metropolitan Borough of Sunderland, Tyne and Wear, England (OS grid ref NZ3547).

(UK, vulgar) Any receptive sex partner is acceptable.