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The Collaborative International Dictionary
Pregravate

Pregravate \Pre"gra*vate\, v. t. [L. praegravatus, p. p. of praegravare to be heavy upon, fr. praegravis very heavy.] To bear down; to depress. [Obs.]
--Bp. Hall.

Wiktionary
pregravate

vb. (context obsolete nonce English) To bear down; to depress.