dig has 35 distinct synonyms spread across 11 of its 13 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
thrust down or into
“dig the oars into the water”
get the meaning of something
“Do you comprehend the meaning of this letter?”
the site of an archeological exploration
“they set up camp next to the dig”
an aggressive remark directed at a person like a missile and intended to have a telling effect
“his parting shot was `drop dead'”
Synonyms, antonyms and the broader and narrower relations for dig come from Princeton University’s WordNet. Full sources and licences.
a small gouge (as in the cover of a book)
“the book was in good condition except for a dig in the back cover”
the act of digging
“there's an interesting excavation going on near Princeton”