verbo transitivo
Definición 1
Do something 'extempore', i.e. spontaneously, without prior study and rehearsal.
Fuente: Invertext, from Concise Oxford Dictionary
Contexto: But on the Basque conflict he [José Luis Rodríguez Zapatero, Spain's prime minister] improvised, failing to convert a ceasefire into a negotiating process.
Fuente: Financial Times 17/01/2007 (editorial)