English Reference
noun

arms

n.
US /ˈɑɹmz/ UK /ˈɑːmz/ arms

  1. 01 A1 Beginner

    the plural of the body part that goes from your shoulder to your hand.

    the plural form of the upper limb of the human body.

    Simple

    He carried the heavy box in his arms while walking up the stairs.

    In context

    She held the infant securely in her arms, rocking gently to soothe the child before the long flight began.

  2. 02 B2 Upper Intermediate Formal

    weapons, such as guns or bombs, used for fighting or defense.

    weaponry or instruments of war; often used in the context of military equipment or the right to own weapons.

    Simple

    The police found several illegal arms hidden in the back of the truck.

    In context

    The international treaty was designed to limit the trade of small arms in regions currently experiencing civil unrest.

    Usage

    Always plural in this sense.

  3. 03 C1 Advanced Formal

    a special design or picture that represents a family, city, or country.

    distinctive heraldic bearings or emblems, such as a coat of arms, used by a family, institution, or state.

    Simple

    The university's coat of arms is printed on every graduation certificate.

    In context

    The knight's shield bore the ancestral arms of his house, featuring a golden lion against a deep crimson background.

    Usage

    Usually appears in the phrase 'coat of arms'.

Usage arms race

The newborn baby sat in the mom’s arms covered in little white bumps, a heat rash.

The Conversation· 19 Aug 2026

Injuries to the arms and legs were the most common, followed by head or facial injuries.

BBC News· 11 Aug 2026

Etymology 1

From Middle English armes, from Old French armes, from Latin arma (“weapons”), from Proto-Indo-European h₂er-mo-, a suffixed form of h₂er- (“to fit together”), hence ultimately cognate with etymology 2.

Etymology 2

See arm.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin ine-pro *h₂er-mo-
Level B2 · Upper Intermediate
Frequency Very common
Updated