 In a sentence, the lexical tones (that is, the high tones of individual words) tend to fall gradually in a series of steps from high to low.For example, in the sentence "kye kibúga ekikúlu mu Ugáńda" 'it is the chief city in Uganda', the lexical high tones of the syllables "bú", "kú" and "gá" stand out and gradually descend in pitch, the toneless syllables in between being lower.This phenomenon is called 'downdrift'.