一不小心

to be a little bit careless / to have a moment of inattentiveness

to be a little bit careless; to have a moment of inattentiveness

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

no; not so / (bound form) not; un-

small / tiny / few / young

to be careful / to take care

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