-they would perish
The word perecerían is the conditional form of perecer in the third person plural.
See the full perecer conjugation


Si la ley de la selva prevaleciera, seguramente los pequeños y los débiles perecerían.
If the law of the jungle were to prevail, the small and the weak would certainly perish.
Sabía que esos tesoros perecerían; pero las ricas verdades abiertas a su entendimiento y que obraban en su corazón, vivirían, y si las obedecía, lo conducirían a la inmortalidad.
Earthly treasures he knew would fail; but the rich truths opened to his understanding, operating upon his heart, would live, and, if obeyed, would lead him to immortality.
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