The exact meaning of suppress can depend upon its context. For example:
"suppressed the revolution" — to stop others from doing something by force
"suppressed a smile" — kept something from happening
"suppressed the story" — kept news from spreading
"suppressed her fear" — controlled an emotion
"suppressed the memory" — avoided thinking about (perhaps even removed from conscious memory)
In Otero, that night, was when he first killed and he hoped he would not have to kill in this of the suppressing of these posts.
Chapter 15 (26% in)
Their old one that they had before the new religion came from the far end of the Mediterranean, the one they have never abandoned but only suppressed and hidden to bring it out again in wars and inquisitions.
Chapter 23 (91% in)
There are no more uses of "suppress" in For Whom the Bell Tolls.