income and expenses / free associations / (idiomatic) run of the house (i.e., control of what happens in the house)

enter and leave

pressing something in under pressure: injecting / (chemistry) forcing / (chemistry) penetration / (chemistry, machining) a press fit / (medicine) an indentation

indent / press into / inject

Entering a stage of enlightenment (such as with Buddhism).

Enter a stage of enlightenment.

inhalation

inhale

intervene, step in (an argument), edge in (a market)

the act of mixing; the state of being mixed; a mixing or mingling of two or more things, typically in an undesirable way