Meaning

• Organized, large-scale, armed conflict between countries or between national, ethnic, or other sizeable groups, usually involving the engagement of military forces.

  "The war was largely between Sunni and Shia militants."

• A particular conflict of this kind.

• (by extension) Any conflict, or anything resembling a conflict.

  "You look like you've been through the wars."

• Instruments of war.

• Armed forces.

• A particular card game for two players, notable for having its outcome predetermined by how the cards are dealt.

Meaning

• To engage in conflict (may be followed by "with" to specify the foe).

• To carry on, as a contest; to wage.