be on a collision course

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be on a collision course

Of a person, group, or object, to be on a certain path to conflict, collision, destruction, or ruin with someone or something else. The radical coalition is set to be on a collision course with the majority government this year. Little did the passengers know that their train was on a collision course with disaster.
See also: collision, course, on

be on a collision course

if two people or groups are on a collision course, they are doing or saying things which are certain to cause a serious disagreement or a fight between them All attempts at diplomacy have broken down and the two states now appear to be on a collision course. (often + with ) The British government is on a collision course with the American administration over trade tariffs.
See also: collision, course, on