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believe

believe /bəˈliːv/ verb
believes; believed; believing
believe
/bəˈliːv/
verb
believes; believed; believing
Britannica Dictionary definition of BELIEVE
not used in progressive tenses
[+ object]
: to accept or regard (something) as true
opposite disbelieve
: to accept the truth of what is said by (someone) opposite disbelieve
[+ object] : to have (a specified opinion) : think
[no object] : to regard the existence of God as a fact : to have religious beliefs
[no object] : to have trust in the ability, worth, etc., of someone or something
informal used for emphasis in phrases that express certainty, surprise, annoyance, etc.

believe in

[phrasal verb]
believe in (something)
: to have faith or confidence in the existence of (something)
: to have trust in the goodness or value of (something)
believe in (someone) : to have trust in the goodness or ability of (someone)

can't believe your eyes/ears

◊ If you can't believe your eyes/ears or can hardly/scarcely believe your eyes/ears, you are very surprised at or upset by what you are seeing or hearing.

make believe

: to act as though something that is not true or real is true or real : pretend
see also make-believe

seeing is believing

◊ The expression seeing is believing means that when you actually see something, you have to believe that it exists or is true.

— believable

/bəˈliːvəbəl/ adjective [more believable; most believable]

— believably

/bəˈliːvəbli/ adverb

— believer

noun, plural believers [count]