Land

Arsa (gr. arsis, elevation) - in ancient poetry it is the stronger part of the poem. The second, weaker part of the poem is called the thesis. is derived from the "raising" of the foot in the dance, accompanied by singing - arsa was the syllable (or part) of the foot that was sung at the moment when the dancer took his own foot off the ground. As a result, arsa was initially just a rhythmically weak part of the poem.

However, with the rise of singing and recitation, which was not accompanied by the dance, the term "elevation" began to be associated with the accompanying lyrics of the rising and falling voice. In Greek, which had a tonal accent, raising the tone of the voice was equivalent to accenting the syllable. Therefore, the term arsis changed meaning and began to mean not weaker, but just more metric and generally accented part of the foot.

In the late antiquity, in both Greek and Latin, the rhythmic value of the quantitative lines began to mimic, placing the emphasis on the arithmetic in the recitation. Hence the frequent illusion that the ikt, or the rhythmical button that arses, is the same as the accent.

wiki