English Thesaurus
(noun) 
Definition
a conventional mark or symbol that has a specific meaning, for example £ for pounds
Equations are generally written with a two-bar equals sign.
Synonyms
symbol
The artist uses the oak tree as a symbol of strength.
,
mark
He made marks with a pencil.
,
character
Chinese characters inscribed on a plaque
,
figure
Deduct the second figure from the first.
, , ,
logo
The letter bore no company name or logo.
,
badge
Urbanization became both a goal and a badge of progress.
,
emblem
The eagle was an emblem of strength and courage.
, ,
(noun) 
Definition
a gesture, mark, or symbol intended to convey an idea or information
The priest made the sign of the cross over him.
Synonyms
figure
A figure appeared in the doorway.
,
form
She saw the form of a person coming towards her.
,
shape
the shapes of the trees against the sky
,
outline
She could see only the hazy outline of the trees.
(noun) 
Definition
a gesture, mark, or symbol intended to convey an idea or information
They gave him the thumbs-up sign.
Synonyms
gesture
She made a menacing gesture with her fist.
,
signal
The event was seen as a signal of support.
,
motion
He made a neat chopping motion with his hand.
, ,
cue
He took this as his cue to leave.
,
(noun) 
Definition
a board or placard displayed in public and intended to advertise, inform, or warn
a sign saying that the highway was closed
Synonyms
notice
I saw a little notice advertising an open day at a nearby estate.
, ,
warning
She came into my room without warning.
,
signpost
,
placard
The marchers sang and waved placards.
,
road sign
,
traffic sign
(noun) 
Definition
a visible indication
His face and movements rarely betrayed any sign of nerves.
Synonyms
indication
He gave no indication that he was ready to compromise.
,
evidence
Police said there was no evidence of a struggle.
,
trace
The church has traces of fifteenth-century frescoes.
,
mark
Shopkeepers closed their shutters as a mark of respect.
,
note
He has never been able to read or transcribe musical notes.
, ,
suggestion
that fashionably faint suggestion of a tan
,
symptom
Your problem with sleep is just a symptom of a larger problem.
,
hint
I'd dropped a hint about having an exhibition of his work.
, ,
gesture
He called on the government to make a gesture of goodwill.
,
clue
Scientists have discovered a clue that may unlock the puzzle.
a vital clue to the killer's identity
,
token
He sent her a gift as a token of his appreciation.
,
manifestation
Different animals have different manifestations of the disease.
,
giveaway
The only giveaway was the look of amusement in her eyes.
,
vestige
She had lost every vestige of her puppy fat.
,
spoor
(noun) 
Definition
an omen
It is a sign of things to come.
Synonyms
omen
Her appearance at this moment is an omen of disaster.
,
warning
a warning of impending doom
,
portent
This is a frightening portent for the future.
,
foreboding
No one paid any attention to their gloomy forebodings.
,
presage
Soldiers used to believe a raven was a presage of coming battle.
,
forewarning
,
writing on the wall
We should have seen the writing on the wall and guessed what was coming.
,
augury
The auguries of death are gathering around him.
,
auspice
,
wake-up call
(verb) 
Definition
to make a sign to someone so as to convey an idea or information
She signed to me to go out.
Synonyms
gesture
I gestured towards the boathouse and he looked inside.
,
indicate
The survey indicated that most old people are independent.
,
signal
She signalled a passing taxi.
,
wave
He waved to us from across the street.
,
beckon
He beckoned to the waiter.
,
gesticulate
The man was gesticulating wildly.
,
use sign language
(verb) 
Definition
to write (one's name) on (a document or letter) to show its authenticity or one's agreement
I got him to sign my copy of his book.
Synonyms
,
initial
Would you mind initialling this voucher?
,
inscribe
The book is inscribed: To John Arlott from Laurie Lee.
,
subscribe
,
set your hand to

Phrasal verbs

See sign on

Additional synonyms

in the sense of augury
Definition
an omen
The auguries of death are gathering around him.
Synonyms
herald (literary),
harbinger (literary),
forewarning,
auspice,
puku (New Zealand)
in the sense of badge
Definition
any revealing feature or mark
Urbanization became both a goal and a badge of progress.
in the sense of beckon
Definition
to summon with a gesture
He beckoned to the waiter.

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English Translation of "sign"
English Translation of "sign"
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Video: pronunciation of 'sign'

Source

Thesaurus for sign from the Collins English Thesaurus
#moon50
The moon is at the forefront of our minds as we celebrate the 50th anniversary of Neil Armstrong’s ‘small step’ on 20th July, 1969. This month, we’ve been exploring lunar terminology, as well as looking at how the moon has woven itself into the fabric of our everyday language.
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