secret language
nounUK /ˈsiː.krət ˈlæŋ.ɡwɪdʒ/
US /ˈsiː.krət ˈlæŋ.ɡwɪdʒ/
A secret language is a special way of talking that only certain people can understand.
The two friends made up a secret language so nobody else could understand their plans.
OTHER MEANINGS
2. A set of words or signs used by a group so outsiders cannot understand them.
The club members used a secret language to share their meeting times.
3. A made-up way of speaking that children invent for fun.
My sister and I invented a secret language with funny sounds.
4. A hidden way of writing, such as a code, that keeps a message private.
The spy wrote the note in a secret language only her boss could read.