It basically means to read between the lines. So if you like someone as more than a friend and they are giving off signals, asking you to come out, and keeps touching you or flirting with you, then you should get the hint that they like you a lot and you should do something about it, IE, ask her/him out. But there can be more meaning than that...
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I am not familiar with the term "comotation." It may be a typographical error or a rare term not widely recognized. Could you provide more context or clarify the term you are referring to?