1mis·take 
/məˈsteɪk/ noun
plural mis·takes /məˈsteɪk/ noun [count] : something that is not correct : a wrong action, statement, or judgment : error
▪ It would be a mistake to assume that we can rely on their help. ▪ There must be some mistake. ▪ a stupid/careless mistake ▪ a costly/serious/bad mistake ▪ a deadly/fatal/tragic mistake ▪ The manuscript contains numerous spelling mistakes. ▪ There's a mistake in the schedule. ▪ “When does the movie start?” “At 8:00. No, wait—my mistake—it starts at 8:30.” ▪ Don't worry about it. It was an honest mistake. [=something that anyone could be wrong about] — often used with make ▪ Everybody makes mistakes from time to time. ▪ I made the mistake of believing her. — see also make no mistake (below)
▪ It would be a mistake to assume that we can rely on their help. ▪ There must be some mistake. ▪ a stupid/careless mistake ▪ a costly/serious/bad mistake ▪ a deadly/fatal/tragic mistake ▪ The manuscript contains numerous spelling mistakes. ▪ There's a mistake in the schedule. ▪ “When does the movie start?” “At 8:00. No, wait—my mistake—it starts at 8:30.” ▪ Don't worry about it. It was an honest mistake. [=something that anyone could be wrong about] — often used with make ▪ Everybody makes mistakes from time to time. ▪ I made the mistake of believing her. — see also make no mistake (below)
and no mistake
chiefly Brit, old-fashioned — used to stress the truth or accuracy of a statement ▪ She's the one I saw, and no mistake. [=she is definitely the person I saw]
by mistake
: because of a mistake : without intending to
▪ I got on the wrong train by mistake. [=accidentally]
▪ I got on the wrong train by mistake. [=accidentally]
make no mistake
— used to stress the truth or accuracy of a statement ▪ Make no mistake (about it), if we don't address these problems now, they will only get worse.
