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Entry 1 sense Webster, 1913

Double-acting

· Dou·ble-act·ing · IPA
01 a. Acting or operating in two directions or with both motions; producing a twofold result; as, a double-acting engine or pump.
  1. 1.
    Acting or operating in two directions or with both motions; producing a twofold result; as, a double-acting engine or pump.