Thinking that something might be true or that someone might have done something wrong, without having clear proof.
From Latin 'suspectus,' past participle of 'suspicere' (to look up at, regard with suspicion). The 'sus-' means under and '-spicere' means to look, so literally 'looking at something from below' with doubt or wariness.
The word 'suspect' literally comes from 'looking at someone from below' in a doubtful way—it's like your gaze becomes distrustful, and this physical metaphor of how you look at someone you doubt shaped the entire psychology of suspicion.
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