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 increase into a large amount
to remain firm in your beliefs or decisions even under press...
Continue with determination despite difficulties.
to make sure everything is fair or equal
to increase something sharply on a specific item
to gradually stop using or providing something