upon

on top of something or someone; above

encima de, sobre

• upon somebody/something

Collocations upon the table · upon his head

• The cat sat upon the fence.

  El gato se sentó encima de la cerca.

at a particular moment in time; when something happens

cuando, en cuanto

• upon the arrival of somebody/something

Collocations upon his arrival · upon hearing the news

• Upon seeing her, he ran away.

  Al verla, él se fue corriendi.

to have an effect on someone or something; to influence

influenciar en, afectar a

• upon somebody/something

Collocations upon the decision · upon his health

• The weather had a great effect upon her mood.

  El clima tuvo un gran efecto en su estado de ánimo.

in accordance with; according to the rules or laws of something

según, conforme a

• upon the law

Collocations upon the constitution · upon the regulations

• The decision was made upon the rules of the court.

  La decisión se tomó conforme a las reglas del tribunal.