arch

/ɑ:tʃ/
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arch

The cat arches its back while stretching in a sunbeam.

Definition
  1. Noun:

    • A curved structure: In architecture, an arch is a curved masonry construction that spans an opening and supports the weight above it.
    • A curved shape: Any curved shape resembling this architectural form, especially one in a vertical plane.
    • A part of the body: A curved bony structure in the body, such as the arch of the foot.
  2. Verb:

    • To form a curve: To bend or curve into the shape of an arch.
  3. Adjective:

    • Playfully mischievous: Behaving in a way that is knowingly and often teasingly mischievous or sly.
    • Principal, chief: (Often used in combination) Chief or extreme of its kind.
Usage and Examples
  • Noun (Architecture):

    • The ancient Romans were masters of building stone arches.
    • We walked through the arch of the old city gate.
  • Noun (Shape/Body Part):

    • The rainbow formed a perfect arch across the sky.
    • High arches in your feet can sometimes cause pain.
  • Verb:

    • The cat will arch its back when it feels threatened.
    • The trees arch over the pathway, creating a natural tunnel.
  • Adjective (Mischievous):

    • She gave him an arch look, knowing she had won the argument.
    • His arch comments were meant to be humorous but sometimes offended people.
  • Adjective (Chief/Extreme - often in compounds):

    • He was considered the arch-villain of the story.
    • The politician was her arch-rival.
Advanced Usage and Nuances
  • "arch-" as a prefix: When used as a prefix, it means chief, principal, or extreme.

    • arch-enemy (chief enemy)
    • archbishop (chief bishop)
    • arch-conservative (extreme conservative)
  • Tone of the adjective: The adjective "arch" often carries a tone of sophisticated, knowing, or ironic mischief. It is not merely playful but implies a clever or sly awareness.

Variants and Related Words
  • Arched (adj): Having the form of an arch; curved.
    • The room had an arched ceiling.
  • Archery (n): The sport of shooting with a bow and arrow. (Note: This word is related through the concept of the bow's curve, but is a distinct term).
  • Arc (n/v): A part of the circumference of a circle or other curve. To move in a curved path.
    • The ball arced through the air.
Synonyms
  • Noun (structure): curve, vault, dome, span.
  • Verb: curve, bend, bow, arc.
  • Adjective (mischievous): mischievous, sly, knowing, ironic, roguish, impish.
Antonyms
  • Noun (structure): straight line, beam, lintel.
  • Verb: straighten, flatten.
  • Adjective (mischievous): sincere, straightforward, earnest.
Idioms and Common Phrases
  • Triumphal arch: A monumental structure in the shape of an arch, often built to celebrate a military victory.
    • The Arc de Triomphe in Paris is a famous triumphal arch.
  • Arch of the foot: The curved, raised part of the sole of the foot.
  • Fall through the arch: (Historical/obsolete) A phrase sometimes related to failing a test or examination at certain universities.
arch

The cat arches its back while stretching in a sunbeam.

Adjective
  1. naughtily or annoyingly playful
    • teasing and worrying with impish laughter
    • a wicked prank
  2. expert in skulduggery
    • an arch criminal
  3. (used of behavior or attitude) characteristic of those who treat others with condescension
Noun
  1. (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it
  2. a passageway under a curved masonry construction
    • they built a triumphal arch to memorialize their victory
  3. a curved bony structure supporting or enclosing organs (especially the inner sides of the feet)
  4. a curved shape in the vertical plane that spans an opening
Verb
  1. form an arch or curve
    • her back arches
    • her hips curve nicely