1 word for CDEEFILNNOORTVY 15-letter words

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15 letters (1)

Walk furtively (up to someone)
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Hint 1 meaning
To go or move with one side foremost; to move sidewise; as, to sidle through a crowd or narrow opening.
Hint 2 anagram
LSIDE
Hint 3 another clue
Move
3 +1