The difference between Stand by and Waste time
When used as verbs, stand by means to wait in expectation of some event, whereas waste time means to allow time to elapse in an unproductive manner.
check bellow for the other definitions of Stand by and Waste time
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Stand by as a verb (idiomatic, intransitive):
To wait in expectation of some event; to make ready.
Examples:
"Please stand by for more instructions."
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Stand by as a verb (idiomatic, transitive):
To remain loyal or faithful to.
Examples:
"Even though money is scarce sometimes, Ann stands by her decision to be a full-time mother."
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Stand by as a verb (idiomatic, transitive):
To support; to continue to support despite things being bad.
Examples:
"They stood by us all along and it's awesome to see them out here to support us today."
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Stand by as a verb (intransitive):
To do nothing. To be inactive in a situation.
Examples:
"I can't simply stand by and watch you ruin your life."
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Stand by as a verb (intransitive):
to be ready to provide assistance if required.
Examples:
"The tug stood by in case it was needed."
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Waste time as a verb:
To allow time to elapse in an unproductive manner.