a cat block

This occurs when one or more napping or resting cats block the way through areas such as stairs or doors.

Susie said "mommy Fluffy and Muffy have the stairs in a cat block!"

by I, Wreckerrr August 14, 2020

black cat in a coal cupboard

An analogy to keeping something secret. Or for keeping something dark or quiet.

Gandalf: Is it secret, is it safe?
Frodo: just like a black cat in a coal cupboard!

Employee 1: Who knows about the promotions?
Employee 2: Noone, they are keeping is as black as a black cat in a coal cupboard!

by Charcoal44 June 19, 2011