The German expression for the English expression: To be in fear = Blut und Wasser schwitzen. It indicates essentially: to sweat blood as well as water.
The English expression: 'to throw in the towel' = in German: 'das Handtuch werfen'. The actual meaning is the same in English and German in this case. 'To throw in the towel' means that someone gives up, admits defeat or surrenders.
An amusing German expression for saying: to do something without much effort, effortless or I could do it on my head = I kann das im Schlaf. Literal meaning: I can do that asleep.
When you get involved in a fight or disagreement with someone, or to quarrel with someone, a hilarious German expression is made use of: Sich mit jemandem in die Wolle kriegen or mit jdm. in die Wolle geraten. Essentially: to obtain into the woollen with somebody
The English expression: to show someone up, to tell somebody off = Means in German: Jemandem aufs Dach steigen. Essentially: to climb on someone's roof