to be in favor with someone
in jemandes Gunst sein (in jemandes Gunst sein)
"If you want to get promoted, you need to be in the boss’s good books."
"Wenn du befördert werden willst, musst du in den guten Büchern des Chefs sein." (Wenn du befoerdert werden willst, musst du in den guten Buechern des Chefs sein.)
to stay out of trouble; to behave properly
deeply in love
to support your words with actions or financial commitment
to try your best or use all your energy
A person who is very enthusiastic and eager to do something.
a general practical principle based on experience