A bird of the genus Hirundo, esp. H. rustica, a well-known migratory bird with long pointed wings and forked tail, having a swift curving flight…

concrete. A deep place or cavity, an abyss; a deep part of the sea, etc. Obsolete.

The deep part of the sea, or of a lake or river (opposed to shallow); deep water; a deep place.

A depth or abyss of water; a yawning gulf; a whirlpool. Obsolete or archaic.

A deep water; a deep part of the sea, or of any body of water. Usually in plural; now only poetic and rhetorical.

A profound depth (in a river, the ocean); the deep. poetic.

Chiefly poetic. The deepest or innermost part of something; a very deep place; an abyss; spec. the depths of the sea (cf. deep, n. 3a). Also figur…

Any deep immeasurable space; a profound chasm or gulf. Also figurative. Cf. abyss, n. 2, 3.