(temporal location, idiomatic) Late into the night or early morning; when people ought to be sleeping.

formerly / simultaneously, at once.

During sequentially discrete instances.

Simultaneously. / On the other hand (introducing an opposing viewpoint).

In a single, continuous period of time. / Simultaneously at each occurrence (of some action).

Under discussion. / In disagreement.

(idiomatic) Mutually misunderstanding each other's plans, intentions or meanings.

(UK) Alternative form of all cats are grey in the dark

(US) Alternative form of all cats are grey in the dark

A card, similar in size to a business card, conveying personal non-business contact information; may be used as an invitation to visit.