bibbern

Etymology
The contemporary form since the 19th century from, probably already , a frequentative of (🇨🇬), cognate of. Compare 🇨🇬 (1700). In spite of the late attestations, these informal verbs might be rather old in view of the etymologically regular gemination -ēv- → -ibb-, though this can also be due to analogy. Earlier High German variants are (18th c.), perhaps also  (East Central German, late 17th c.). These are formed directly from.

Verb

 * 1) to shiver
 * 2) to jitter