adding a superfluous 're' to the potential form of a godan verb
A linguistic term describing non-standard potential forms like 行けれる instead of 行ける, or 書けれる instead of 書ける. Often discussed alongside ら抜き言葉.
See also: ら抜き言葉
'Re-tasu kotoba' refers to the way of speaking where an extra 're' is added to the potential form of godan verbs.
Forms like 'ikereru' and 'kakereru' are often cited as examples of re-tasu kotoba.