(chess) A move in which a pawn captures an opposing pawn on the same rank immediately after the latter has moved forward two squares on its first move in the game, as if it had moved forward only one square.

Alternative spelling of passer-by

A person who is passing by (that is, walking past).

A bird of the extinct species Ectopistes migratorius, formerly endemic to North America.

In a passionate manner.

Any bird of the order Passeriformes, which comprises more than half of all bird species.

Of, or relating to a passerine or perching bird.

plural of passerby

In a passable fashion, moderately; adequately.

The state of being passable.