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The Pilpel stem is a variation of the Piel and has potential to express the same range of verbal action. The Pilpel stem is formed from the Piel by dropping the 2nd radical and repeating the 1st and 3rd radical, thus making a verb that appears to have 4 consonants. It is a rare stem formation in Biblical Hebrew. Many of the occurrences of the Pilpel stem in the Hebrew Bible are from the root verb כּוּל ("to comprehend, contain").
Note
It is recommended to always check a dictionary or lexicon for the meaning of a specific verb, because this stem may express many different kinds of action in different contexts.