Put the wood in the hole

This is a colloquial North of England expression of uncertain origin and date.

The ‘wood’ is the door and the expression is usually used when someone leaves a door open and lets in cold air to a warm room. Television dramas have given the term a wider audience but it is still largely confined to the North of England. Even there it is less used than before, probably due to the increased used of central heating which means there is less cause to use it.