double-handedly

adverb4

1. •
   Using both hands at the same time.

   • Working double-handedly also conserves your hands in large kneading strokes, for example when you are working on the adductors on the inside of the thigh. — 2007
2. •
   Using two people.

   • Dinghies are designed to be sailed single-handedly or double-handedly, but some larger cruising dinghies may have room for four or more people on board. — 2013
3. •
   By means of two approaches or agents

   • The combination of discontent and economic collapse brought about the revolution. It did not do so simply double-handedly. — 2014
4. •
   Duplicitously or hypocritically.

   • NATO works double-handedly against Albanians and Serbs. — 2010