One of the mysteries of the English language finally explained.
get to work, get down to work, apply oneself, set to work, fall to, buckle down, get down to business, put one's hand to the plough, roll up one's sleeves, get things moving, start the ball rolling
work hard, make an effort, strive, be assiduous, be diligent, be industrious, exert oneself
informal give it one's best shot, get cracking, get one's finger out, get weaving, get the show on the road, get off one's backside
British informal get stuck in
dated buckle to
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