foreslay means to slay beforehand or in advance. Lexicurio rates it Rare gem — a strength score of 82 out of 100.
Etymology
From fore- + slay.
verb
- To slay beforehand or in advance.“Sole Mediator, God had promised Him, In Eden'd [sic] days an offering for sin, Immaculate conceived, the Holy One, Ere yet the earth was fashioned, the Lamb of God fore-slain.”