Under the gun is a phrase that is used to describe a situation in which someone is under a great deal of pressure or stress. The two crossword solutions for this phrase are STRESSED (8 letters) and UPAGAINSTIT (11 letters). STRESSED is an adjective that describes a feeling of being overwhelmed or anxious due to a difficult situation. UPAGAINSTIT is a combination of the words 'UP' and 'against it' and is used to describe a situation in which someone is facing a difficult challenge.