Wiktionary
signing on
vb. (present participle of sign on English)
Usage examples of "signing on".
And it wouldn't be the first time: while there were some tasks that just could not be delegated or postponed until after sundown, I rebelled against my nocturnal condition by signing on for more than my necessary share of daytime excursions.
I knew signing on that I'd be serving that function to some degree, but I didn't quite expect it would be this much.
Saddest of all, she actually came within *this* much of signing on as the Molly-analog in JOHNNY MNEMONIC, but then didn't.
Domingo said he could probably drop her at some Milkpail world if she would prefer that to signing on.