s, o, g, n, i are letters that make 'sign on'
sign, si, SI, on, Si, Ig are words within 'sign on'
1 possible definitions for 'sign on'
Under this definition, sign on is a verb and has the following properties:
sign, contract, sign up have the same meaning as 'sign on'
'sign on' can be a type of hire, engage, employ.
contract out is a type of sign on.
contract, signer, signatory are derivatives of 'sign on'.