Unfortunately, there’s no word in English that’s both related to “instulping” and has only 4 letters. “Instulping” itself is already a 9-letter word.
However, depending on what aspect of “instulping” you’re interested in, there might be some shorter alternatives:
- Tuck (5 letters): This can refer to the act of pushing something inward, similar to instulping.
- Fold (4 letters): This is a general term for bending something over on itself, which can also be related to instulping.
- Dip (3 letters): This can describe a downward movement, which might be relevant if you’re focusing on the inward curve of instulping.
If you can provide more context about what you’re looking for, I might be able to suggest other similar words that are shorter.