What is impinge on?

Some articles on impinge on, impinge:

Shemini Atzeret - Observances and Customs - Carryover of Sukkot Observances
... anything that is permitted on yom tov and does not impinge on Shemini Atzeret carries over to Shemini Atzeret ... year due to the weather, so sleeping in the sukkah may impinge on one's own joy during the festival ... Likewise, eating in the sukkah does not per se impinge on one's own celebration of Shemini Atzeret ...
Rhythmi-metrical Scansion - Peter L. Groves
... describing how contiguous syllables impinge upon each other ... contrastive accent) these syllables may impinge more strongly on their neighbors than regular A, B, O ... In the first (rhythmic) line of scansion, syllables that impinge on their neighbors are connected by hyphens in the second (metrical) line, positions that have ...