Thread:User talk:Kephir/About the word "背信"/reply

私は日本語がどっこいどっこいです. 心得はありがとう.

Wiktionary does not (usually) rely on other dictionaries, but on actual real-world use. I have added 背信する to RFV; if nobody finds the verb to be in use, it will be deleted. There is a quite large backlog in RFV, unfortunately.