An assistant to a churchwarden, one of whose duties is to collect offerings during a service.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "sidesman" in a sentence
"As we rose from our knees one Sunday a sidesman said, ` Vicar, I wish you would pray for my boy."
"The sidesman gave him a prayer book and a hymn book, and he chose a seat towards the back, because the order of the service was still strange to him and from there he could see when other people knelt, and when they stood."
"When he began to make money, he went over to the Church and took the plate round at collecting time, and got to be a sidesman, and a trustee, and I don't know what all."