1640s, "to quake, tremble," phonetic variant of Middle English didderen (late 14c.), which is of uncertain origin. The sense of "vacillate, be anxious" is from 1819. Related: Dithered; dithering.
例文
1. The sight of the policeman made the murderer all of a dither .
警官を見ると、その殺人者は震えていた。
2.He was in a dither .
彼は慌てていた.
3.There are valve dither and valve set point circuit to improve the performance of the system.