The Hebrew and Greek that is typically translated as “confess” in English in the context of these verses is translated in a variety of ways. Here are some (back-) translations:

• Highland Puebla Nahuatl, Tzeltal: “say openly”
• San Blas Kuna: “accuse oneself of one’s own evil”
• Kankanaey: “tell the truth about one’s sins”
• Huastec: “to take aim at one’s sin” (“an idiom which is derived from the action of a hunter taking aim at a bird or animal”) (source for this and all above: Bratcher / Nida)
• Tabasco Chontal: “say, It is true, I’ve done evil” (source: Larson 1998, p. 204)
• Central Pame: “pull out the heart” (“so that it may be clearly seen — not just by men, but by God”) (source: Nida 1952, p. 155)
• Shipibo-Conibo: “say, It is true I have sinned” (source: Nida 1964, p. 228)
• Obolo: itutumu ijo isibi: “speak out sin” (source: Enene Enene).
• Tagbanwa: “testify that one would now drop/give-up sin” (source: Tagbanwa Back Translation)
• Kutu: “speak sin” (source: Pioneer Bible Translators, project-specific translation notes in Paratext)

See also confessing their sins.