to not express your emotions or worries
seine Emotionen oder Sorgen nicht auszudrücken (seine Emotionen oder Sorgen nicht auszudrücken)
"He tends to keep things bottled up instead of talking about them."
"Er neigt dazu, alles in sich zu behalten statt darüber zu sprechen." (er neigt dazu, **keep things bottled up** statt darüber zu sprechen.)
to show someone that they are not as important as they think
to manage to stay alive or survive
to have an extremely analytical and efficient mind
to cause complete failure in a system or process
to investigate or examine something
to decide to do something without being asked or required