go to it (?.)
- attack
- dive into
- enter on
- enter upon
- fall to
- get busy
- get cracking
- get going
- get with it
- hop to it
- jump to it
- launch into
- light into
- pitch in
- pitch into
- plunge into
- sail into
- set about
- set at
- set to
- set to work
- start in
- tackle
- take on
- turn to
- undertake
- wade into