verb

• (transitive, intransitive) To move hard-packed earth out of the way, especially downward to make a hole with a shovel. Or to drill, or the like, through rocks, roads, or the like. More generally, to make any similar hole by moving material out of the way.
  "They dug an eight-foot ditch along the side of the road."
• (transitive) To get by digging; to take from the ground; often with up.
  "to dig potatoes"
• (mining) To take ore from its bed, in distinction from making excavations in search of ore.
• (US, slang, dated) To work like a digger; to study ploddingly and laboriously.
  "Peter dug at his books all the harder."

noun

• (archaic, slang) A hard blow, especially (boxing) a straight left-hander delivered under the opponent's guard.
  "[…] 'let him go, I tell you, or I'll be after breaking your ugly mug,' and with that I gave him a dig that knocked him into smithereens."
• (volleyball) A defensive pass of the ball that has been attacked by the opposing team.
• (cricket) An innings.
• (US, colloquial, dated) A plodding and laborious student.
  "Between the two extremes of college men the unsocial dig and the flunking swell, lies the majority, who, acknowledging the duty and merit of hard work, see the value in social and recreative line, but are at somewhat of a loss, seemingly, how to proportionize the time given to the different sides of college life, or how far to allow themselves to go on the more attractive side."

verb

• (dated slang) To understand.
  "You dig?"
• (dated slang, transitive) To appreciate, or like.
  "Baby, I dig you."

noun

• (medicine, colloquial) Digoxin.
  "dig toxicity"