Chapter Swell to Swim of S by Webster's Dictionary (1913 Edition)

Swim
(Swim), n.

1. The act of swimming; a gliding motion, like that of one swimming. B. Jonson.

2. The sound, or air bladder, of a fish.

3. A part of a stream much frequented by fish. [Eng.]

Swim bladder, an air bladder of a fish. — To be in the swim, to be in a favored position; to be associated with others in active affairs. [Colloq.]

Swim
(Swim), v. i. [OE. swime dizziness, vertigo, AS. swima; akin to D. zwijm, Icel. svimi dizziness, svina to subside, svia to abate, G. schwindel dizziness, schwinden to disappear, to dwindle, OHG. swinan to dwindle. Cf. Squemish, Swindler.] To be dizzy; to have an unsteady or reeling sensation; as, the head swims.