There are numerous synonyms for the phrase "dost disservice to," which means to harm or betray someone or something. Some of these synonyms include:
1. Harm - To cause damage or negative consequences
2. Betray - To deceive or turn against someone's trust
3. Damage - To destroy, impair or ruin
4. Undermine - To weaken or erode
5. Sabotage - To intentionally harm or obstruct a plan or action
6. Injure - To cause physical or emotional pain or harm
7. Hurt - To cause pain or suffering
8. Disadvantage - To put at a disadvantage or unfair position
9. Hindered - To prevent or obstruct
10. Deprive - To deny or withhold something essential or deserved.