English definition of “believe”
TRUE [T] › to think that something is true, or that what someone says is true: [+ (that)] They believe that their health has suffered because of the chemicals. Do you believe him? I can't believe that she wants to go out with me. → Opposite disbelieve
THINK [T] › to think something, without being completely sure: "Is he coming home tonight?" "I believe so." The murderer is believed to be in his thirties.
RELIGION [I] › to have religious beliefs
not believe your eyes/ears › to be very surprised when you see someone or something, or when you hear what someone says: I couldn't believe my ears when Dan said they were getting married.
believe it or not › used to say that something is true although it seems surprising: He even remembered my birthday, believe it or not.