1) Act the fifth columnist 2) Bring down 3) Cause the downfall of 4) Corrupt 5) Depose 6) Destabilize 7) Destroy completely 8) Force out 9) French word used in English 10) Overthrow 11) Overturn 12) Undermine 1) Bastardise 2) Bastardize 3) Carnalise 4) Debase 5) Demoralise 6) Demoralize 7) Deprave 8) Derail 9) Misdirect 10) Ruin 11) Sensualise 12) Suborn 13) Undermine 14) Vitiate 
• (v. t.) To overturn from the foundation; to overthrow; to ruin utterly. • (v. i.) To overthrow anything from the foundation; to be subversive. • (v. t.) To pervert, as the mind, and turn it from the truth; to corrupt; to confound.
Sub·vert' intransitive verb To overthrow anything from the foundation; to be subversive. « They have a power given to them like that of the evil principle, to subvert and destroy.» Sub·vert' transitive verb [ imperfect & past participle Subverted ; present participle & verbal noun Subverting .] [ Latin subvertere , subversum ; sub under + vertere to turn: confer French subvertir
[v] - destroy completely
to overthrow (something established or existing). · to cause the downfall, ruin, or destruction of. · to undermine the principles of; corrupt.