rung / wrung are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
rung: (noun) a crosspiece between the legs of a chair.
wrung: (verb) twist and compress, as if in pain or anguish. (verb) twist, squeeze, or compress in order to extract liquid.
rung: r·AH·ng
wrung: r·AH·ng
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)