The difference between Kill time and Waste time
When used as verbs, kill time means to engage in an activity whose only purpose is to make the time seem to pass more quickly, whereas waste time means to allow time to elapse in an unproductive manner.
check bellow for the other definitions of Kill time and Waste time
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Kill time as a verb (informal, intransitive):
To engage in an activity whose only purpose is to make the time seem to pass more quickly; to fill the time between activities.
Examples:
"She had nothing better to do, so she went to the bowling alley to kill time."
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Waste time as a verb:
To allow time to elapse in an unproductive manner.