To deviate from something means to start doing something different or not planned, especially in a way that causes problems for others.
例句
They stopped you as soon as you deviated from the script...一旦你偏离了剧本的内容,他们就会喊停。He planned his schedule far in advance, and he didn't deviate from it...他提前很早就制订出了自己的进度表,然后从未偏离过它。
英汉词典释义
vi.
偏离; 越轨
His statements sometimes deviated from the truth.他的陈述有时偏离事实。
英英词典释义
Noun
1. a person whose behavior deviates from what is acceptable especially in sexual behavior
Verb
1. be at variance with; be out of line with
2. turn aside; turn away from
3. cause to turn away from a previous or expected course;