A feeling/emotion is considered to be suppressed when you are aware of it but do not handle it correctly so it becomes pushed into the subconscious. Repression means that the feeling/emotion never enters the field of awareness but is pushed automatically into the subconscious. Of course the process works for both. You become aware of these suppressed/repressed holdings with a dedicated meditation practice when they will jump up into the stillness or by paying close attention and identifying your projections.