Answer: snuck

AnswerCrossword Clue
SNUCKCrept furtively
SNUCKMoved furtively
SNUCKSmuggled
SNUCKMade a grid play
SNUCKSkulked: Dial.
SNUCKCrept, informally
SNUCKApproached slyly, with "up"
SNUCKMoved stealthily
SNUCKCrept (by)
SNUCKDucked (out) furtively
snuckSNEAK, to move stealthily
snuckto go, act, or take furtively
snuckperson who sneaks