When something is suppressed, it is blocked from occurring or kept in check in some way.
When you impress someone, you do such a great job at something that the other person thinks it's really good and so is filled with praise for it.
If someone is depressed by something, they become unhappy and disappointed with life for a long period of time, and so they don't really want to do much of anything.
When you express your thoughts or feelings about something, you say them or talk about them.
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