Question

(collo) to make peoplehttps://dictionary.cambridge.org/dictionary/english/people feelhttps://dictionary.cambridge.org/dictionary/english/feel less surehttps://dictionary.cambridge.org/dictionary/english/sure about or have less trusthttps://dictionary.cambridge.org/dictionary/english/trust in something or someone (doubt)

Accepted Answer

cast doubt on

Front	(collo) to make people https://dictionary.cambridge.org/dictionary/english/people feel https://dictionary.cambridge.org/dictionary/english/feel less sure https://dictionary.cambridge.org/dictionary/english/sure about or have less trust https://dictionary.cambridge.org/dictionary/english/trust in something or someone (doubt)
Back	cast doubt on

Collo) Make Less About Less In Doubt Cast