The term 'dart about' can be defined as to move quickly and erratically in different directions. This term can be expressed in two crossword solutions: 'SCAMPER' (7 letters) and 'FLIT' (4 letters). 'SCAMPER' is an informal verb meaning to run or move quickly in a playful or excited manner, while 'FLIT' is an informal verb meaning to move quickly and lightly from one place to another. Both words are used to describe the same action of moving quickly and erratically in different directions.