(twit′ər) v.i.
1. To utter a series of light chirping or tremulous notes, as a bird,
2. To titter.
3. Brit. Dial. To be excited; tremble.
—v.t.
4. To utter or express with a twitter.
—noun
1. A succession of light, tremulous sounds.
2. Bot. A disease of plants caused by insects. [Imit.]

(twit′ər) v.t.
To taunt; upbraid. [Freq. of TWIT]

(twit′ər) v.t
Spin or twist unevenly. [<earlier twit, a fault or entanglement in thread; ult. origin uncertain]