Englishfor English speakers
momentum
Noun
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The momentum is the way something keeps going after you stop pushing it.
The rock rolled down the hill. It had too much momentum. Nobody could stop it.
operator
Noun
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An operator is a person who operates something.
Jo is the operator of the tractor.
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An operator is a person who works on making connections for people over the telephone.
The operator was struggling to keep the line connected.