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English definition of “thin”

thin

adjective uk   /θɪn/ (thinner, thinnest) us  

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)Thin and fineNarrow and thin

thin adjective (NOT FAT)

A2 (of the body) with little flesh on the bones: Did you notice how thin her wrists were? Thin, hungry dogs roamed the streets.
Opposite
Thin or slender (of people)Not fit and healthyNarrow and thin
be as thin as a rake (also be as thin as a rail) US to be very thin: He eats like a horse and yet he's as thin as a rake.Thin or slender (of people)Not fit and healthyNarrow and thin

thin adjective (TRANSPARENT)

not difficult to see through: thin mist/cloud
Opposite
Transparent

thin adjective (FEW)

having only a small number of people or a small amount of something: Attendance at the meeting was rather thin.Small in number and quantity

thin adjective (FLOWING EASILY)

(of a liquid) flowing easily: a thin soup
Opposite
Movement of liquidsThe state of matter

thin adjective (WEAK)

weak or of poor quality: a thin excuse a thin disguise a thin smileWeakness and vulnerability
thinness
noun [U] uk   /ˈθɪn.nəs/ us  
the thinness of his hair The author discusses why female beauty has become linked to thinness.Small in number and quantityThin or slender (of people)Not fit and healthyNarrow and thin

thin

verb uk   /θɪn/ (-nn-) us  

thin verb (LESS THICK)

[T] to make a substance less thick, often by adding a liquid to it: Thin the sauce down with a little stock.Preparing foodPreparing food using heat

thin verb (FEWER)

[I or T] (also thin out) When a crowd or a group thins (out), it becomes fewer in number, and when you thin (out) a group of plants or other things, you remove some to make them fewer: The traffic will thin out after the rush hour.Becoming and making smaller or lessBecoming and making less strong
Phrasal verbs
(Definition of thin from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of thin?
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