Crossword puzzle clue "figures out in slang"

DOPE, to give a narcotic to

COED, a girl student at a coeducational institution

wretchedly shabby; of a poor quality

LOAD, to place goods or cargo on transportation, also LADE, LADEN, LAID, LOADEN

CRACK, to break without dividing into parts

DECODE, to convert a coded message into plain language