If people try to make fun or laugh when things are very frightening, dangerous, life-threatening or hopeless, it is gallows humour (or "gallows humor").
(UK) If someone is paid for a period when they are not working, either after they have given in their notice or when they are being investigated, they are on gardening leave.
Getting a sheepskin (or your sheepskin) means getting a degree or diploma. (Sheepskin refers to the parchment that a degree is printed on- parchment comes from sheepskin.)
If you get your hands dirty, you become involved in something where the realities might compromise your principles.
It can also mean that a person is not just stuck in an ivory tower dictating strategy, but is prepared to put in the effort and hard work to make the details actually happen.
If you get your teeth into something, you become involved in or do something that is intellectually challenging or satisfying. ('Dig you teeth into' and 'sink your teeth into' are also used.)
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