bring it on!; I'm ready for anything; leave it to me
A bold, confident phrase used to accept a challenge or express readiness to handle whatever comes. Often used in competitive or confrontational contexts, but can also be a casual, encouraging response.
"Aren't you scared of the match?" "Bring it on!"
I'm ready for any question you throw at me.
The phrase likely derives from どんと (an emphatic, onomatopoeic element suggesting a heavy or bold impact) combined with the imperative form of 来る (くる, 'to come'). The exact origin is uncertain, but it has been used as a set expression for confident acceptance of a challenge.