La bise or le bisou means kiss: French friends and acquaintances exchange kisses on alternating cheeks upon meeting and separating. Two people introduced by a mutual friend may also faire la bise, particularly kids and young adults.
The number of kisses and the side that the kisses start on vary by region and by other factors that are more difficult to pin down.
Two bises (one on each cheek) is the most common, exchanged between family and friends of all ages as well as between people of the same age who are introduced by friends or family.
Three bises is common in Provence. In addition, a friend of mine in Rouen gave me three bises the day I arrived and the day I left, but only two during the week in between. Four kisses are exchanged in Nantes
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