godan verb (-su)
make someone believe; lead to believe
Used when someone deliberately causes another person to believe something, often by persuasion or trickery. The verb is transitive and takes a person as the object.
彼は私にその話が本当だと信じ込ませた。
He made me believe that story was true.
詐欺師は被害者
The con artist led the victim to believe a fake investment story.