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to feel confident and determined about a belief or decision
to feel certain about something
to feel confident that a person or organization is good or reliable
to be certain about what you like and what you want
to be completely certain of something
if you can depend on someone to do something, you are sure that they will do it
to feel certain about something, although you cannot explain or prove it
to be certain that something will happen or bring you success, especially when this makes you spend all your money on it
in competitive cycling, the illegal use of motors on bikes in order to gain advantage over other riders
to get a score in golf of one shot more than par
be reversed; be as if it had never happened
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Free thesaurus definition of to be certain from the Macmillan English Dictionary - a free English dictionary online with thesaurus and with pronunciation from Macmillan Publishers Limited.