I

in it
to let another partake of any benefit or acquisition acquired by robbery or otherwise
Called putting him in it. A family-man who is accidentally witness to a robbery, etc, effected by one or more others, will say to the latter: Mind, I'm in it. which is generally acceded to, being the established custom, but there seems more of courtesy than right in this practice.
in town
flush of money
Also known as breeched.