doubleacting

double-acting

[duhb-uhl-ak-ting]
adjective
1.
(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.
2.
(of a hinge of a door or the like) permitting movement in either direction from the normal, or closed, position.
3.
having twice the usual effectiveness, strength, use, etc.

Origin:
1835–45

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
double-acting
 
adj
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

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