SNICKER

snicker. Snicker, v.i. to laugh slily or contemptuously

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Snick″er (?), v. i. [imp. & p. p. Snickered (?); p. pr. & vb. n. Snickering.] [[Cf. D. snikken to sob, to sigh.]] [Written also snigger.] 1. 1. To laugh slyly; to laugh in one's sleeve.
2. 2. To laugh with audible catches of voice, as when persons attempt to suppress loud laughter.