The phrase 'loyal partner' is correct and usable in written English.
You can use this phrase to describe a person in a relationship or business partnership who is trustworthy and reliable. For example: My business partner has been a loyal partner over the past five years.
Your loyal partner, D. Fehr.
A beautiful, loving, caring, gregarious, friend and loyal partner.
Merkel, his most loyal partner in that endeavor, has announced she will soon leave public life.
Dr. Buscaino was a fine cardiologist, a loyal partner, a devoted husband and father.
Lehman Brothers mourns the loss of our loyal partner and valued friend of twenty years.
And besides, Nestlé had been a steady, loyal partner of L'Oréal and the Bettencourts for 40 years.
Throughout the war in Iraq, the Kurds were the Americans' most loyal partners, offering up the peshmerga to form the nucleus of the new Iraqi Army and one of their own leaders, Jalal Talabani, to be the President of Iraq.
Sir Richard is again dismissing speculation about his solvency, saying he is courting the stock market only to allow his loyal partners, many of whom are venture capitalists, to cash out of their investments.
Saudi Arabia's ambassador to Washington and his wife, confronting concerns that some of their charitable contributions may have ended up in the wrong hands, say that they are loyal partners in the Bush administration's fight against terrorism and that they are pained that the donations are unfairly putting new strains on American-Saudi relations.
Others think orgasms are an evolutionary novelty that persists because it helps foster loyal partners.
In the film's opening scene, Renton sprints through Edinburgh's streets with his loyal partner-in-crime and fellow junkie, Spud (Ewen Bremner).
