thin (Verb) — Lose thickness; become thin or thinner.
thin (Verb) — Make thin or thinner. ex. "Thin the solution"
thin (Verb) — Lessen the strength or flavour of a solution or mixture.
thin (Verb) — Take off weight.
thin (Adjective) — Of relatively small extent from one surface to the opposite or in cross section. ex. "thin wire" ex. "a thin chiffon blouse" ex. "a thin book" ex. "a thin layer of paint"
thin (Adjective) — Lacking excess flesh. ex. "you can't be too rich or too thin"
thin (Adjective) — Very narrow. ex. "a thin line across the page"
thin (Adjective) — Not dense. ex. "a thin beard"
thin (Adjective) — Flowing easily or low in density; not viscous. ex. "air is thin at high altitudes" ex. "a thin soup" ex. "skimmed milk is much thinner than whole milk" ex. "thin oil"
thin (Adjective) — (of sound) lacking resonance or volume. ex. "a thin feeble cry"
thin (Adjective) — Lacking spirit or sincere effort. ex. "a thin smile"
thin (Adjective) — Lacking substance or significance. ex. "a thin plot"; a fragile claim to fame"
thin (Adverb) — Without viscosity. ex. "the blood was flowing thin"