The phrase "acted as proxy for" is correct and usable in written English.
It can be used in contexts where someone is representing or acting on behalf of another person or entity.
Example: "During the meeting, she acted as proxy for her colleague who was unable to attend."
Alternatives: "served as a representative for" or "functioned as a stand-in for".
Two years later, a marriage by proxy took place at Arthur's Tickenhill Manor in Bewdley, near Worcester; Arthur said to Roderigo de Puebla, who had acted as proxy for Catherine, that "he much rejoiced to contract the marriage because of his deep and sincere love for the Princess".
In this study parents'/guardians acted as proxy for children and may not have reported their child's health accurately.
And nobody would want to go back to the era when Western nations acted as proxies for the religious institutions with which they were closely, if informally, linked.
Moreover, at times they've also acted as proxies for the United States: most famously, in the 1980's, by funneling American arms to the rebels who bled the Soviets dry in Afghanistan.
Until now, the two countries have each controlled 22.5 percent of the company through a mix of state holding companies and private-sector owners that have acted as proxies for Paris and Berlin.
Participants <18 years of age were interviewed with parents or guardians, who acted as proxies for younger children, as appropriate.
Two of the authors (CMB, KWK), who co-facilitated the focus groups, acted as proxies for focus group members.
The categories capturing women's selection (routinely screened vs preidentified based on risk factors) may have acted as proxies for more specific mechanisms of association, such as history of injection drug use.
And in line with the Conservative commitment to what Lawson called 'rolling back the frontiers of the State', this oversight was not performed directly by the government, but was entrusted to an array of outside consultants and agencies who acted as proxies for consumer interests (Lawson, 1980, p. 5; Rose, 1993; Power, 1997).
Members the 'Say No campaignpaign have offered to act as proxy for anyone who cannot make the EGM and would like to vote no.
These backbone nodes act as coordinators, do the synchronization of sleeping schedules and also act as proxy for the sleeping sensor nodes.
