means To touch or press your lips against someone or something as a sign of affection, greeting, or respect.

from From Old English 'cyssan,' to kiss, with cousins all across the Germanic family — Old Norse 'kyssa,' Dutch 'kussen,' German 'küssen.' The whole clan likely traces back to a shared Proto-Germanic root, 'kussjan,' which may itself be an imitative word — that soft little 'kuss' sound the lips make. So the word might literally be the noise of the act, frozen into language.