Definition of "debruised"

The lion of England and the lilies of France without the baton sinister, under which, according to the laws of heraldry, they were debruised in token of his illegitimate birth.

1849–1861, Thomas Babington Macaulay, chapter 2, in The History of England from the Accession of James the Second, volumes (please specify |volume=I to V), London: Longman, Brown, Green, and Longmans

Serpent, embowed, the head debruised, or surmounted of the tail; also blazoned, […]

1828, William Berry, Encyclopaedia Heraldica, Or Complete Dictionary of Heraldry, page 5