Crush verb - To put a stop to (something) by the use of force.
Usage example: the government is doing everything to crush the latest guerrilla uprising
Repress is a synonym for crush in suppress topic. In some cases you can use "Repress" instead a verb "Crush", when it comes to topics like overcome, engulf.
Repress verb - To put a stop to (something) by the use of force.
Usage example: quickly repressed the rebellion in the provincial city and restored order
Crush is a synonym for repress in suppress topic. You can use "Crush" instead a verb "Repress", if it concerns topics such as overcome, subdue, oppress, engulf.
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Google Ngram Viewer shows how "crush" and "repress" have occurred on timeline