一心

wholeheartedly / heart and soul

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]

to unite as one

concentrating one's thoughts and efforts / single-minded / bent on / intently

millions of people all of one mind (idiom); the people united

to multitask

of one heart and one mind (idiom)

to do two things at once (idiom) / to multitask / to divide one's attention