(transitive) To make sparse; to remove some of a group of newly-planted plants in order to allow the remaining ones to grow unimpeded / (intransitive) To become sparse.

Both thickets and thin woodland; (through) all obstacles in a path. / (idiomatic) Both good and bad times.

(idiomatic) Overly sensitive to criticism; quick to take offence; irritable; touchy / Used other than figuratively or idiomatically: see thin, skinned.

Very thin, as thin as a wafer. / Extremely marginal or tenuous.

scarce, or difficult to find.

(simile, rare) Very thin, unhealthily thin.

A type of scissors used in hairdressing that has a serrated edge and which is used to reduce the bulk of a section of hair rather than the length.

very thin, as paper is; insubstantial.

Somewhat cylindrical and slender like a pencil; also, tall and thin.

An approach to computing based around the use of thin clients.