Slumber (Verb) - Vine's Expository Dictionary of New Testament Words
Slumber (Verb)[ 1,,G3573, nustazo ]
denotes to nod in sleep" (akin to neuo, "to nod"), "fall asleep," and is used
(a) of natural slumber, Matthew 25:5;
(b) metaphorically in 2 Peter 2:3, negatively, of the destruction awaiting false teachers.