(intransitive) To be nearly used up or consumed, so that little remains.

(electronics) (of a circuit, electronic, etc.) Made with thin films deposited on a ceramic or glass substrate.

A layer of material deposited on a substrate as a coating of one atom or one molecule in thickness.

(analytical chemistry) A form of chromatography in which the solid phase is silica gel or a similar inert material supported on a glass plate.

(analytical chemistry) Alternative spelling of thin-layer chromatography

(idiomatic) To be (or to place oneself) in a risky, potentially dangerous or delicate situation.

(idiomatic) Something that if allowed or accepted to a small degree would lead to systematic encroachment.

Alternative form of thin end of the wedge

(idiomatic) From nowhere or nothing; from a non-existent or unknown source.

present participle of skate on thin ice