I. twit ‧ ter 1 /ˈtwɪtə $ -ər/ BrE AmE verb [intransitive]
[ Date: 1300-1400 ; Origin: From the sound ]
1 . if a bird twitters, it makes a lot of short high sounds
2 . to talk about unimportant and silly things, usually very quickly and nervously in a high voice
II. twitter 2 BrE AmE noun
1 . [singular] the short high sounds that birds make
2 . be all of a twitter ( also be in a twitter ) British English to be excited and nervous:
She’s been all of a twitter since her daughter’s engagement.