The difference between Faff about and Waste time
When used as verbs, faff about means to waste time, whereas waste time means to allow time to elapse in an unproductive manner.
check bellow for the other definitions of Faff about and Waste time
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Faff about as a verb (intransitive):
To waste time; spend time idly.
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Waste time as a verb:
To allow time to elapse in an unproductive manner.