びっくり

Etymology
Derivation from the root found in other terms such as,. The underlying meaning of the root appears to be or.

This is one of many adverbs formed by the addition of the suffix to the root, and then gemination of the middle consonant. The suffix may derive from the auxiliary verb, itself from classical verb.

*biku → bikuri → bikkuri

The kanji spellings for this term are very rare. The kana spellings or  are much more common.

Adverb

 * 1) startledly, surprisedly, astonishedly

Verb

 * 1) to be surprised, to be startled, to be frightened, to be astonished