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Wiktionary
tentmaking

n. The manufacture of tents.

Wikipedia
Tentmaking

Tentmaking, in general, refers to the activities of any Christian who, while dedicating him or herself to the ministry of the Gospel, receives little or no pay for Church work, but performs other ("tentmaking") jobs to provide support. Specifically, tentmaking can also refer to a method of international Christian evangelism in which missionaries support themselves by working full-time in the marketplace with their skills and education, instead of receiving financial support from a Church. The term comes from the fact that the apostle Paul supported himself by making tents while living and preaching in Corinth ( Acts 18:3).