Answer: burrowing

AnswerCrossword Clue
burrowing(of an animal) Make a hole or tunnel, esp. to use as a dwelling
burrowingMove (something) in this way
burrowingMove underneath or press close to something in order to hide oneself or in search of comfort
burrowingAdvance into or through something solid by digging or making a hole
burrowingBURROW, to dig a hole of tunnel in the ground
burrowingMake a thorough inquiry; investigate