English translation:
what is…again?
was it… that… ?
did you say…?
Structure:
Verb[ た ] + っけ
Verb[ る ] + ん/の + だ/だった + っけ
いAdj[い] + かった + っけ
Noun + だ / だった + っけ
なAdj + だ/だった + っけ*
Explanation:
[Informal question marker. Used mostly when speaker has trouble with recalling something・is unsure about something and seeks confirmation of the hearer.“What was that thing called?” type of questions.]