verb
1.
to set about doing something energetically
had a lot to do and decided to pitch in
Synonyms: buckle (down), fall to, jump (in or into), set to, wade (in or into)
Related Word: attack, tackle; launch, tee off; begin, commence, start (off or out or up)
Idioms: fall to it, fall to work, get busy ( or cracking), get down to it, get going, get ( or have) with it, go to it, hop ( or jump) to it
Contrasted words: dally, dawdle, procrastinate, stall; vacillate
2.
Synonyms: contribute 1, chip in, come through, kick in, subscribe