(nautical) All plank that is more than four inches thick and less than twelve.

(dated) Lime, sometimes mixed with plaster, etc., used as material for the finishing coat in plastering.

(dated) timber sawn into lengths and then split

(idiomatic, euphemistic) Used in place of fuck you.

(intransitive, informal) To be knowledgeable in a particular field.

(idiomatic) To worry about petty issues or insignificant matters.

(idiomatic) strong and determined (especially more so than someone else, to whom one is being compared).

(informal, derogatory) Greasy hair oil. / (informal, derogatory) Something puerile or not worth bothering with.

(informal) To show what one is capable of.

Synonym of do one's thing