Poisʹson dʹAvril
.An April fool. The poisson dʹAvril is the mackerel, and we have the expression “You silly mackerel,” and silly indeed are those who allow themselves to be caught by the palpable jokes engendered on the 1st of April. The Scotch say “hunting the gowk” (cuckoo). It is said that the best explanation is a reference to Matt. xxix. 2.