(humorous) To be using a lot of obscure or complicated words.

simple past tense and past participle of swallow a bitter pill

plural of barn swallow

(Britain) A sinkhole; a shakehole.

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.

a swan dive

A small passerine bird, taxonomic name Hirundo neoxena

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

To completely enclose or envelop. / To take over or absorb something (especially an organisation) so it no longer has a separate identity; to assimilate.

Alternative spelling of swallowtailed