one's elevator doesn't go all the way to the top floor
/wʌnz ˈɛləˌveɪtɚ ˈdʌz.ənt ɡə ɔːl ðə weɪ tʰu̟(ː) ðə tɒp flo(ː)ɹ/
someone is not very smart
“He joked that one's elevator doesn't go all the way to the top floor.”
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