put a rocket under (someone or something)

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put a rocket under (someone or something)

To motivate or incentivize someone to do something faster, better, or with greater energy or enthusiasm. Primarily heard in UK. It's been over a week now and we still haven't gotten our delivery! I think it's time you called customer support and put a rocket under them. Here's hoping the new manager will put a rocket under his squad, because they've been looking like amateurs the past few games.
See also: put, rocket