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long arm of the law, the

long arm of the law, the idiom

The far-reaching power of the authorities. For example, You'll never get away with leaving work early; the long arm of the law is bound to catch you. This expression began as Kings have long arms (or hands) and was listed as a proverb in 1539. The current version, now often used lightly, was first recorded in 1908.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.