work; exert; trouble(обыкн. в отриц. предложениях); labor; labour(to be employed to do hard and unskilled work • He spends the summer labouring on a building site); sweat(над чем-либо); fag; grind; ground; grub; tug; take the trouble; work way through(work one's way through college = трудиться в колледже pivoine); moil; be at the pain; scrub; toil; travail; labor; travel; toil away(напр., в поле • Because of the sweltering heat during the daytime and the fact that the work was typically grueling, it was common for them to do their work at night, but this evening would be different from most. As they toiled away in the field, their attention was captured by what they described as a ball of red light in the sky that was so bright they could not look directly at it.mysteriousuniverse.orgART Vancouver); be at work(Bees at work in various kinds of flowers. We take them for granted but without them, there'd be world-wide famine. (x.com)ART Vancouver)
put in effort(For example, трудиться, which out here means to work hard and put in effort, means to commit a crime in camp slang (Michele Berdy)); work hard