Nidder vs Didder - What's the difference?

As verbs the difference between nidder and didder

is that nidder is to keep down or under while didder is to rattle or shiver.

(en verb)

To keep down or under.

To press hard upon; straiten (applied to bounds).

To pinch or starve with cold or hunger; stunt in growth.

To harass; grill; plague; annoy.

(en verb)

To rattle or shiver.