get with it (?.)
- act on
- act upon
- attack
- bear a hand
- dive into
- do something
- do something about
- enter on
- enter upon
- fall to
- get busy
- get cracking
- get going
- go
- go to it
- hop to it
- jump to it
- launch into
- lift a finger
- light into
- maneuver
- pitch in
- pitch into
- plunge into
- proceed
- proceed with
- sail into
- set about
- set at
- set to
- set to work
- start in
- strike a blow
- tackle
- take a hand
- take action
- take measures
- take on
- take steps
- turn to
- undertake
- wade into