apply (oneself)
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Synonyms:
attend to, dedicate oneself, devote oneself, address oneself, be occupied with, keep one's mind on, direct oneself to, concentrate on, persevere in, persist in, give oneself wholly to, be industrious, work at, buckle down, keep one's nose to the grindstone, be diligent, be hardworking, work hard at, get down to work