1. lead up - Noun
2. lead up - Verb
set in motion, start an event or prepare the way for
Source: WordNetlead-up
Long ago we parted,” said the slight, still man of the Fiia. "Longer ago we were one. What we are not, they are. What we are, they are not. Think of the sunlight and the grass and the trees that bear fruit, Semley; think that not all roads that lead down lead up as well. Ursula K. Le Guin
A lot of action movies today seem to have scenes that just lead up to the action. Jason Statham
Hitler's attack on Poland led up to World War II Source: Internet
A bushfire reaching Lithgow in the lead up to Christmas. Source: Internet
According to researchers at the University of Geneva, people with that personality combination showed better preservation of brain areas that usually deteriorate and lose volume during the aging process and lead up to an Alzheimer’s diagnosis. Source: Internet
Also on the campaign trail this week, has met with city council hopefuls in the lead up to the election. Source: Internet