decay

(intransitive, electronics, of storage media or the data on them) To undergo bit rot, that is, gradual degradation.

(intransitive, computing, of software) To undergo software rot, that is, to fail to be updated in a changing environment, so as to eventually become legacy or obsolete.

(intransitive, physics, of a satellite's orbit) To undergo prolonged reduction in altitude (above the orbited body).

(intransitive, of organic material) To rot, to go bad.

(intransitive, transitive, physics, chemistry, of an unstable atom) To change by undergoing fission, by emitting radiation, or by capturing or losing one or more electrons; to undergo radioactive decay.

(intransitive, transitive, physics, of a quantum system) To undergo optical decay, that is, to relax to a less excited state, usually by emitting a photon or phonon.

(intransitive, aviation) Loss of airspeed due to drag.

(transitive) To cause to rot or deteriorate.

(programming, intransitive) Of an array: to lose its type and dimensions and be reduced to a pointer, for example when passed to a function.