Meaning of “thin” in the English Dictionary

"thin" in British English

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thinadjective

uk /θɪn/ us /θɪn/ thinner, thinnest

thin adjective (NOT THICK)

A2 having a small distance between two opposite sides:

a thin book
thin black lines
a thin jacket (= made from thin material)

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thin adjective (NOT FAT)

A2 (of the body) with little flesh on the bones:

Did you notice how thin her wrists were?
Opposite
be as thin as a rake UK mainly US be as thin as a rail

to be very thin:

He eats like a horse and yet he's as thin as a rake.

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thinness
noun [ U ] uk /ˈθɪn.nəs/ us /ˈθɪn.nəs/

the thinness of his hair
The author discusses why female beauty has become linked to thinness.

thinverb

uk /θɪn/ us /θɪn/ -nn-

(Definition of “thin” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"thin" in American English

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thinadjective [ -er/-est only ]

us /θɪn/ -nn-

thin adjective [ -er/-est only ] (NOT DEEP)

having a small distance from the top to the bottom side:

The statue is coated with a thin layer of gold.

thin adjective [ -er/-est only ] (NOT FAT)

having little extra flesh on the body:

thin arms/legs
a thin face
Models must be tall and thin.

thin adjective [ -er/-est only ] (FEW)

having only a few of something covering an area; not dense:

His hair is thin on top.
Where there is little rain, grass and trees get thinner.

thin adjective [ -er/-est only ] (FLOWING EASILY)

(of a liquid) flowing easily:

We began dinner with a thin but tasty soup.

thin adjective [ -er/-est only ] (WEAK)

lacking force or substance; weak:

a thin, metallic tone
I thought the plot was a bit thin.
We slept poorly that night in the thin mountain air.

thinverb [ I/T ]

us /θɪn/ -nn-

thin verb [ I/T ] (BECOME FEWER)

to become fewer in number, or to make a group of things fewer in number:

[ I ] Traffic thins out after seven o’clock.

(Definition of “thin” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"thin" in Business English

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thinadjective

uk /θɪn/ us thinner, thinnest

FINANCE, COMMERCE if trading, etc. is thin, not many people are buying or selling shares, etc.:

Investor perceptions may decrease the value of high-risk bonds, especially in a thin market.
In another day of thin trading, the FTSE 100 rose 21 to 5269.5.

having only a small number of people or a small amount of something, especially money:

Wages are lower in the area, and union membership is thin.
Turnover was extremely thin.
a thin budget
a thin margin/profit margin

COMMERCE a situation in which there is only a small difference between the total cost of making and selling something and the price it is sold for, or between the total amount of money a company receives from sales and the total cost of producing all its products and services:

Cost is an issue in a business that operates on thin margins.
be stretched thin

to not have enough money, people, supplies, etc. to operate, do a job, or provide what is needed:

Without more money, the programs would be stretched thin.
In the current economic climate, doctors and nurses are stretched thin and equipment is lacking in many of the clinics.
the thin end of the wedge UK

something that is not very harmful in itself but that will be the start of a harmful development:

The introduction of a fee for the service has been described as "the thin end of the wedge" by union leaders.
thin on the ground UK

existing only in small numbers or amounts:

Good strategic leaders are very thin on the ground in UK companies.

(Definition of “thin” from the Cambridge Business English Dictionary © Cambridge University Press)