hired gun
noun
N. Amer. informal <北美, 非正式>
1
- a hired bodyguard, mercenary, or assassin雇佣保镖; 雇佣兵; 雇佣杀手。
2
- an expert brought in to resolve complex legal or financial problems or to lobby for a cause排忧解难专家（为解决复杂法律或财务问题或为某目标游说而雇佣的专家）。