(idiomatic, Yorkshire, Lancashire, Manchester, of a door) To shut.

(computing) A computer attack strategy, in which the victim is a particular group (organization, industry, or region), and the attacker guesses or observes which websites the group often uses and infects one or more of them with malware.

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.