Etymologically

In Russian, the words for "caress, endearment" and "least weasel" are homonymous and possibly related etymologically.

Source: tatoeba (4458504)

Etymologically, checkmate means "the king is dead". However, the king has not "died" in the game of chess for a long time. In fact, the king is the only piece that cannot even be captured, although checkmate finishes the game and, strictly speaking, can be considered as a "death" for the king.

Source: tatoeba (9971095)

Rivalry means, etymologically, a dispute between landowners because Roman properties were often separated by a river ("rivus" in Latin).

Source: tatoeba (12301996)

The Greeks and Romans referred to everyone else as "barbarians" -- etymologically those who only babble, only go "bar-bar."

Source: wiktionary