Idiom Definition:
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"to give a head start"
to allow an advantage to another person or people usually in a competitive situation before the competition begins
Synonyms:
advance, advancement, advantage, ahead, begin, burst, dash, early, edge, erupt, gain, go, improve, improvement, jump, lead, leg-up, lunge, rush, spring, stampede, superiority
The man in the green shirt is
giving a head start to the other man. - - - - ->