noun
- something whose name one cannot remember, does not know, or does not wish to specify
Usage: informal
Examples
- Can you hand me that whatsit on the table?
- I need to fix this whatsit before the machine will work.
- There’s a little whatsit missing from this assembly.
- What’s this whatsit supposed to do?
- The whatsit fell off and now I can’t find it.
- Use that whatsit to tighten the screws.