(colloquial) A situation where one harms one's reputation or standing by making ill-advised remarks.

(UK politics) An election loss for a prominent politician.

(Australia, colloquial) A situation of acute embarrassment or failure.

plural of moment arm

A moment in time at which something changes irrevocably

(US politics, informal) A situation where a politician says something controversial that harms their chances of success.

A moment that a person will remember in vivid detail

A seminal moment, in reference to the conversion of Paul the Apostle on the road to Damascus.

The best time to do something, when those involved are in the most workable state of mind.

As the hasty result of strong, passionate feelings and without thoughtful consideration.