Both-handed

"“I'm ambidextrous,” she replied. “Both-handed. Dad says it's rare.”"

"[Morimori, looking for a pair of scissors in the desk] Shinzuki Morimori Shinzuki: Yes, that is right. This is asymmetric one, so it is both-handed."

"He stood a bit far of the gloom of the lobby, but short of the dazzle of the stairs, and he clenched his briefcase at his chest in a tense and both-handed, reptilian grip, as if whatever he had in it must be guarded at all costs."

"The principle of being “both-handed” or “talk for talk and fight for fight” suggests the necessity to combine soft means with tough ones and to struggle while seeking cooperation."

"Then the brown-haired detective charged around the corner firing both-handed, skimming two off Stephen's vest, while Stephen himself danced one round off the detective's and they fell backward simultaneously."

"Our second front will, in fact, comprise both the Atlantic and Mediterranean coasts of Europe, and we can push either right-handed, left-handed, or both-handed as our resources and circumstances permit."