Question: abide is regular or irregular?
Answer: Several online dictionaries, Collins included, report 'to abide' as a regular verb, so the simple past and the past participle are 'abided'. The other ones report the verb as an irregular verb, with PT and PP both as 'abode', others report PT 'abode' and PP 'aboden', and others yet relate PT 'abode' and PP 'abiden'.