quiet as a church mouse

bit by a barn mouse

tipsy; slightly drunk

darken a church door

To go to church to attend a service.

dust mouse

A dust bunny.

have a quiet word

To speak to someone in private.

keep quiet

To refrain from talking about something; to keep a secret.

poor as a church mouse

Very poor, to the point of starving or begging; utterly destitute.

quiet as a mouse

Very quiet, so as to not be heard.

quiet quit

To cease overachieving at one's workplace to focus on one's personal life; to do only what is reasonably or contractually required.