[Imitative.] intr. To snigger or snicker.

1

1815.  Scott, Guy M., lii. As for the Dominie,… he looked at Lucy—he whimpered—he sniggled—he grinned.

2

1840.  C. Brontë, in Mrs. Gaskell, Life (1857), I. 215. [The preacher] did not whine; he did not sniggle.

3

1889.  A. C. Gunter, That Frenchman! vi. At which flattery the other sniggles and calls him a wit.

4

  Hence Sniggling ppl. a.

5

1826.  Scott, Woodst., xii. Wildrake laughed without ceremony,… and was joined by a sniggling response from behind the cupboard.

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