ace in the hole
C1Informal
Definition
Meaning
A hidden advantage or a secret resource kept in reserve until the right moment to ensure success.
Any person, factor, or strategy held back as a crucial secret weapon, especially in a situation of competition or difficulty. Originally from poker, where the 'hole' card is dealt face down.
Linguistics
Semantic Notes
Often implies a single, decisive, hidden asset. The word 'ace' metaphorically carries the idea of something excellent or unbeatable. Unlike a simple 'advantage', it is typically concealed and strategically revealed.
Dialectal Variation
British vs American Usage
Differences
The phrase is well-understood in both varieties. In the UK, the synonymous 'ace up one's sleeve' is arguably more common. 'Ace in the hole' originated in American poker and retains a strong association with that variety.
Connotations
Both share connotations of cunning, preparedness, and strategic withholding. The American usage may more directly evoke the original gambling context.
Frequency
More frequent in American English. In British English, 'ace up one's sleeve' is generally the preferred variant in equivalent contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
[Person/Entity] has an ace in the hole: [Resource/Person].[Person/Entity] kept [Resource/Person] as an ace in the hole.[Person/Entity] played their ace in the hole.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Hold all the aces (related, but broader)”
- “Ace up one's sleeve (synonymous variant)”
Usage
Context Usage
Business
Our new, unannounced partnership is the ace in the hole for the merger negotiations.
Academic
The researcher's unpublished data from a previous study served as her ace in the hole during the peer-review debate.
Everyday
Don't worry about the final round of the quiz—I've got an ace in the hole with my knowledge of 80s music.
Technical
In cybersecurity, a zero-day exploit is often considered an ace in the hole for both attackers and defensive researchers.
Examples
By CEFR Level
- The team thought they were losing, but their captain had an ace in the hole.
- The lawyer's ace in the hole was a surprise witness the defence knew nothing about.
- Despite the bleak quarterly reports, the CEO remained calm, confident that the upcoming product launch was her ace in the hole to sway the investors.
Learning
Memory Aids
Mnemonic
Picture a poker player secretly looking at their 'hole' card—an Ace—while keeping a straight face. That hidden Ace is their guaranteed win, waiting for the right moment.
Conceptual Metaphor
COMPETITION IS A CARD GAME / A STRATEGIC ADVANTAGE IS A WINNING CARD.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate literally as 'туз в дыре'—it is meaningless. The closest conceptual equivalent is 'козырной туз в рукаве' (ace up the sleeve).
- Avoid confusing it with 'козырь' (trump card), which is not necessarily hidden or secret.
Common Mistakes
- Using it for a simple, obvious advantage (e.g., 'His height was his ace in the hole in basketball'—this is not hidden).
- Incorrect preposition: 'ace on the hole' (incorrect).
- Using plural: 'aces in the hole' is rare and changes the meaning to multiple assets.
Practice
Quiz
In which of these situations would 'ace in the hole' be LEAST appropriate?
FAQ
Frequently Asked Questions
They are nearly synonymous. 'Ace in the hole' originates from stud poker (hole card face down). 'Ace up one's sleeve' originates from cheating by hiding a card in one's clothing. The latter can imply more active deceit, while the former is a standard strategic holdback. 'Ace up one's sleeve' is more common in British English.
Yes, commonly. E.g., 'Our star striker, recovering from injury, is the manager's ace in the hole for the final.'
Not necessarily. It is strategic and secretive, but the context determines the morality. In business or sports, it's seen as smart strategy. In personal relationships, it could be seen as manipulative.
Very rarely. The phrase is almost always singular ('an ace in the hole'). Using the plural ('aces in the hole') suggests multiple separate hidden advantages, which dilutes the core idea of a single, decisive resource.