(of a reciprocating engine, pump, etc.) having pistons accomplishing work in both directions, fluid being admitted alternately to opposite ends of the cylinders. Compare single-acting.
(of a hinge of a door or the like) permitting movement in either direction from the normal, or closed, position.
having twice the usual effectiveness, strength, use, etc.

1835–45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To double-acting
World English Dictionary
1.  Compare single-acting (of a reciprocating engine or pump) having a piston or pistons that are pressurized alternately on opposite sides
2.  (of a hinge, door, etc) having complementary actions in opposed directions

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
If power is added to the downward falling hammer, the hammer is referred to as double-acting.
Two steam reciprocating, double-acting, duplex pumps handle pumping duties.
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