From Old Norse roðna.
rodna (present tense rodnar, past tense rodna, past participle rodna, passive infinitive rodnast, present participle rodnande, imperative rodna/rodn)
- (intransitive) to redden (to become red)
röd + -na
rodna (present rodnar, preterite rodnade, supine rodnat, imperative rodna)
- to blush
- to redden, to become red
Conjugation of rodna (weak)