Hide (one's) head in the sand informal verb phrase
To avoid, or attempt to avoid, a specific problem by pretending not to see it.
Hide your head in the sand if you want to. Anyway, you must be responsible for the accident.
Don't hide your head in the sand. You need quick treatment to stop the rapid growth of leukemia cells.
To hold tightly to something with one's fingernails to avoid falling
people often do irrational or foolish things when they are in love.
I and my boyfriend have decided to get married in the summer. I don't think that's wise, since we won't have enough money saved by then to set up house. But then, one cannot love and be wise.