zone out
verb
zoned out; zoning out; zones out
1
US, informal
: to become oblivious to one's surroundings especially in order to relax
zone out in front of the TV
2
US, informal
: to become unfocused or inattentive because of tiredness or boredom
Students began to zone out towards the end of the assembly.
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Merriam-Webster unabridged
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