形容詞 off and on:

1. intermittently stopping and starting
   同義詞：fitful, interrupted, off-and-on

副詞 off and on:

1. not regularly
   同義詞：on and off

1. A device that automatically switches an electric lamp off and on, as in a commercial display sign.
   閃光裝置如廣告宣傳告示上的一種自動點燃或熄滅電燈的裝置
2. Recently it rained off and on every day.
   近來每天都在斷斷續(xù)續(xù)地下雨。
3. He has been writing to us off and on for several years.
   他斷斷續(xù)續(xù)地給我們寫信已經(jīng)有好幾年了。
4. He only accepted the primary education off and on in his childhood.
   他小時候只斷斷續(xù)續(xù)地接受過初等教育。