ACAS means: Advisory, Conciliation and Arbitration Service.. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.
ACAS
(British) Advisory, Conciliation and Arbitration Service.
Seen in the wild
BlueskyMay 2026
Urgh, how awful...sadly I've always been left wanting by unions both here and in Ireland. Unite were not good at all, more after your subscription. Have ACAS helped at all, I found them better re verbal advice.
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BlueskyMay 2026
Yeah ACAS have been half decent I keep chasing Unite cos I need a rep in my redundancy meetings and they are just fully blanking me now 😭
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Definitions
UK
#1·Apr 27, 2026UK
(British) Advisory, Conciliation and Arbitration Service.
For parents
ACAS means: Advisory, Conciliation and Arbitration Service.. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.
For ESL learners
ACAS means: Advisory, Conciliation and Arbitration Service.. Register: neutral, standard English. A common learner mistake is using the word in a register it does not fit, or assuming a single global meaning; native speakers immediately notice when slang appears in formal contexts, so always check the surrounding register before producing it yourself. A formal-English equivalent (a synonym or descriptive phrase) is usually safer in writing. When in doubt, paraphrase rather than reuse the slang form.
Heard in the wild
“Urgh, how awful...sadly I've always been left wanting by unions both here and in Ireland. Unite were not good at all, more after your subscription. Have ACAS helped at all, I found them better re verbal advice.”
— Bluesky· May 2026“Yeah ACAS have been half decent I keep chasing Unite cos I need a rep in my redundancy meetings and they are just fully blanking me now 😭”
— Bluesky· May 2026
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Global
#2·May 3, 2026Global
Assistant Chief of the Air Staff, a senior appointment in the Royal Air Force
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Global
#3·May 3, 2026Global
Acâș, a commune in Satu Mare County, Romania
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Global
#4·May 3, 2026Global
Airborne collision avoidance system, an International Civil Aviation Organization standard
Cluster: normal
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Global
#5·May 3, 2026Global
Acas (Advisory, Conciliation and Arbitration Service), an independent non-departmental public body of the Government of the UK
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Global
#6·May 3, 2026Global
Aboriginal Children's Advancement Society, an organization in New South Wales
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For specific readers
Why is this section here?
Slang is read by different audiences for very different reasons. The For parents view re-explains the term in plain, non-judgemental language so a caregiver can understand what their child means without needing the surrounding subculture. The For English learners view focuses on register (when it's safe to use), formal alternatives, and common mistakes — what a textbook won't teach you.
Used in
GlobalUK
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🇬🇧About British & Irish slang slang
UK and Irish slang — Cockney, Scouse, Geordie, Yorkshire, Glaswegian, Brummie, Welsh, West Country, plus Irish English. Centuries of regional dialects feeding into modern British and Irish street talk.
See all British & Irish slang slang on Slangora.
Tags
Other words near "ACAS" (A)
academy maxxingacademy modeacademy schoolacademy sznAcadiana cappellaACCaccelerated depreciationacceptanceaccess courseaccessionACCESS test
Browse all slang words starting with A.