to imagine (something) to be true, likely, or probable
I suspect that you are right
to believe (somebody) to be guilty without conclusive proof
They suspected her of giving false information
to distrust or have doubts about (something)
They suspected his motives
[Middle English suspecten, from Latin suspectus, past part. of suspicere to look up at, regard with awe, suspect, from sus- up, secretly + specere to look at]