1. A weapon worn at the left side.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• aide arm,
• zide arm,
• xide arm,
• dide arm,
• eide arm,
• wide arm,
• sude arm,
• sjde arm,
• skde arm,
• sode arm,
• s9de arm,
• s8de arm,
• sise arm,
• sixe arm,
• sice arm,
• sife arm,
• sire arm,
• siee arm,
• sidw arm,
• sids arm

The adjective form of "side arm" is "side-armed".

The plural form of "side arm" is "side arms".

The singular form of the word "side arm" is "sidearm"