Wash the cucumbers thoroughly and slice them thinly.
Place the sliced cucumbers in a large mixing bowl.
In a separate bowl, mix sour cream, mayonnaise, and vinegar.
Add salt, pepper, and dill to the dressing mixture.
Whisk the dressing until smooth and well combined.
Pour the dressing over the sliced cucumbers.
Gently toss to coat the cucumbers evenly with the dressing.
Let the salad sit for 10 minutes to allow flavors to meld.
Serve chilled, garnished with additional dill if desired.