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Webster's 1913 Dictionary

DOUBLE-ACTING

DOUBLE-ACTING Dou "ble-act `ing, a.

Defn: Acting or operating in two directions or with both motions; producing a twofold result; as, a double-acting engine or pump.

New American Oxford Dictionary

double-acting

dou ble-act ing ▶adjective denoting a device or product that combines two different functions: double-acting hydraulic shock absorbers | double-acting baking powder. • (of an engine ) having pistons pushed from both sides alternately.

Oxford Dictionary

double-acting

double-acting ▶adjective 1 (of a device or product ) combining two different functions. 2 (of an engine ) having pistons pushed from both sides alternately.