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поднапрячься vstresses
gen. pull up one's socks (nikulyak); make a push (VLZ_58); make an effort (источник – goo.gl dimock); break a sweat (для достижения какой-либо цели: He loaded all five boxes without breaking a sweat); pull one's socks up (Taras)
idiom. pull up one's socks (VLZ_58)
inf. bust ass (UrbanDictionary: You better be busting your ass if you want to finish the job on schedule. • I was busting my ass to finish my homework on time. 4uzhoj)
sport. try harder (Sergei Aprelikov)