Upon; on top of. / (informal) Aware of. / Used to indicate, or signpost, logical progression to a new topic in a talk or discourse.

present participle of rob Peter to pay Paul

For what purpose, what for, why

(US, poetic) From the Atlantic Ocean to the Pacific Ocean.

(informal) An energetic song that one is compelled to dance to.

(statistics) The phenomenon by which extreme examples from any set of data are likely to be followed by examples which are less extreme; a tendency towards the average of any sample. For example, the offspring of two very tall individuals tend to be tall, but closer to the average (mean) than either of their parents.

(by metonymy) From one household or business to the next. / (by further extension) From shipper to recipient. / (by further extension) From inception to final completion.

Alternative spelling of door-to-door

Full to the brim.

(transitive) To show respect or admiration for (someone); to see (someone) as a role model.