Involving both hands. / Designed to be used with two hands. / Involving two people. / Serving two purposes or involving two approaches. / deceitful; deceptive

With two hands.

simple past tense and past participle of double-hand

Third-person singular simple present indicative form of double-hand

present participle of double-hand

To use both hands to hold.

The use of both hands together. / Ambidexterity / The use of two people, working together. / Duality, the quality of serving two purposes or having two (often contradictory) facets.

Using two people. / Using both hands at the same time. / By means of two approaches or agents / Duplicitously or hypocritically.