1) Bring to heel 2) Conquer 3) Crush 4) Enslave 5) Force to submit or subdue 6) Gain dominion over 7) Keep down 8) Make subservient 9) Master 10) Oppress 11) Quash 12) Reduce 13) Repress 14) Subdue 15) Suppress Found on https://www.crosswordclues.com/clue/subjugate
• (v. t.) To subdue, and bring under the yoke of power or dominion; to conquer by force, and compel to submit to the government or absolute control of another; to vanquish. Found on http://thinkexist.com/dictionary/meaning/subjugate/
Sub'ju·gate transitive verb [ imperfect & past participle Subjugated ; present participle & verbal noun Subjugating .] [ Latin subjugatus , past participle of subjugare to subjugate; sub under + jugum a yoke... Found on http://www.encyclo.co.uk/webster/S/223