Definition of lug in:
(v) :
(idiomatic) To connect (an electrical device) to a plug socket.
(v) :
(idiomatic) To input or enter (data).
(v) :
(idiomatic) To familiarize and integrate (a person) into an organization.
(v) :
(idiomatic, mathematics) To replace a variable with a number in order to solve an equation.
(v) :
To become involved in something.