intransitive. To laugh continuously in a manner not uproarious, but suggestive either of foolish levity or uncontrollable amusement. Cf. snigger, v.1…

(intransitive) to utter tee-hee in laughing; to laugh affectedly or derisively; to titter, giggle; also as tee and hee (nonce).

intransitive. To laugh in a somewhat suppressed or restrained way, often through nervousness or in ridicule; to giggle.

intransitive. To laugh in a somewhat suppressed or restrained way; to titter, giggle, snigger. Cf. twitter, n.3 1b. Now somewhat rare.

intransitive. To utter a half-suppressed laugh; to snigger, titter.