Rur. tired out; worn out. (*Typically: be ~; get ~.) Poor John worked so hard that he's all tuckered out.Look at that little baby sleeping. She's really tuckered out.
One's finest clothes, dressed up, as in The men were told to put on their best bib and tucker for the dinner dance. Although wearing either a bib (frill at front of a man's shirt) or a tucker (ornamental lace covering a woman's neck and shoulders) is obsolete, the phrase survives. [Mid-1700s] For a synonym, see Sunday best.