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whatchamacallit /ˈwɑːʧəməˌkɑːlət/  /ˈwʌʧəməˌkɑːlət/

  • noun
    plural -its
    [count] US informal :something whose name you have forgotten or do not know :thingamajig
    I can't find the whatchamacallit that holds the door open.