v. dial. [Imitative.] intr. = SWATTER v. 1. So Switter-swatter adv. (imitative of the sound made by ducks splashing in water).

1

1694.  Urquhart’s Rabelais, I. xxi. 78. The total Welfare of our humidity doth not depend upon drinking, switter, swatter [ed. 1653 in a rible rable; orig. à tas, à tas] like Ducks.

2

a. 1800[?].  Bonnie Milldams of Binnorie, xi., in Child, Ballads (1882), I. 129/2. Aye she swittert, and aye she swam, Till she cam to yon bonnie mill-dam. [Cf. quot. a. 1800[?] s.v. SWATTER v. 1.]

3