(Britain) A sinkhole; a shakehole.

plural of barn swallow

Hirundo rustica, the most widespread species of swallow in the world; a distinctive passerine bird with blue upperparts, a long, deeply forked tail and curved, pointed wings, is found in Europe, Asia, Africa and the Americas.

(UK) The common tern (Sterna hirundo). / The stormy petrel. / A mollusc of genus Glaucus.

a swan dive

A small passerine bird, taxonomic name Hirundo neoxena

Used other than figuratively or idiomatically: see pill, swallow. / Something to be accepted or tolerated.

plural of swallow hole

Any of various birds in the genus Petrochelidon that nest in cliffs.

A kind of swallow that makes an edible nest.