wrap your head around (something)

hacerse a la idea, entender algo complejo

• I still can't wrap my head around how the algorithm works.
• She finally wrapped her head around the new tax laws after hours of study.
• It's hard for me to wrap my head around the fact that he's leaving the company.

This idiom is informal and often used in daily conversation when discussing concepts or situations that are hard to grasp. It is used by people of all ages and is not uncommon in written language, though more frequent in speech.

A common mistake is saying 'wrap your mind around' instead of 'wrap your head around'. While both expressions exist, 'wrap your head around' is the more commonly used form among English speakers.

• pull the rug out (from under someone)
  dejar a alguien tirado, retirar el apoyo de golpe
• go against the grain
  ir a contracorriente
• have your cake and eat it
  querer la chancha y los veinte, todo a la vez
• burn (your) bridges
  quemar las naves, cerrar puertas