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pack

verb [I or T, usually + adv/prep] (MASS)
 
 
/pæk/

Definition

to (cause to) form into a solid mass: The wind has packed the snow against the garage door. The snow has packed down tightly, making the streets dangerous to walk on.Squeezing and grinding
(Definition of pack verb (MASS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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