This idiom describes someone who is completely compliant, submissive, or devoted to another, willing to follow their lead or do their bidding. It evokes the image of a tame animal eating trustingly from one’s hand, suggesting influence, control, or adoration. The phrase is used in romantic, social, or professional contexts, often with a triumphant or slightly manipulative tone, reflecting the power dynamic between the influencer and the influenced. It underscores charisma or persuasion but can imply exploitation if used cynically.

The phrase likely originated in 19th-century English, rooted in rural life where taming animals by feeding them by hand symbolized trust and control. An early use appears in an 1839 *Blackwood’s Edinburgh Magazine* article: ‘He has them eating out of his hand.’ The idiom gained traction in Victorian England, reflecting social hierarchies and the art of persuasion, as seen in Anthony Trollope’s novels. Its use grew in American English during the 20th century, particularly in politics and business, where influence was key. The phrase’s vivid imagery and relevance to human relationships ensured its spread, especially in contexts of leadership or charm.