To speak frankly and openly, revealing one's true feelings and sincerity; to be open-hearted and straightforward in one's dealings.
他对待同事总是开心见诚，从不隐瞒自己的真实想法，因此深得大家的信任和喜爱。
He always treats his colleagues with an open and sincere heart, never hiding his true thoughts, and thus earns everyone's trust and affection.
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