The term 'crack under pressure' can be summarized by two crossword solutions: SNAP and CHOKE. SNAP is a verb meaning to break suddenly and sharply, usually with a cracking sound. It is often used to describe the sound of a breaking object or a person's reaction to a sudden event. CHOKE is a verb meaning to stop breathing due to a lack of air or an obstruction in the throat. It is often used to describe a person's reaction to a stressful situation. Together, these two words describe the phrase 'crack under pressure, ' which means to become overwhelmed and unable to cope with a difficult situation.