Work like a Trojan
Definition 1 of 1
Pro Tip 1/3Intensity Emphasis
The phrase suggests a very intense level of hard work, often more than usual. 
During the harvest, the farm workers had to work like a Trojan.
Pro Tip 2/3Cultural Origin
Trojans in mythology were known for their hard work during war; it's not related to modern-day Trojans. 
She studied like a Trojan to ace her exams, similar to the warriors' determination.
Pro Tip 3/3Temporary Situation
Usually used for short, intense periods of work rather than a regular work style. 
To meet the deadline, he had to work like a Trojan all week.