"a kiss," 1570, like Welsh and Gael.
bus "kiss, lip," Fr.
baiser "kiss" (from L.
basiare), Sp.
buz, Ger. dial.
buss probably of imitative origin.
Kissing and bussing differ both in this,
We busse our wantons, but our wives we kisse.
[Robert Herrick, "Hesperides," 1648]