Let Go Meaning

(euphemistic, usually reflexively) To gain weight

Example: Used other than as an idiom: see let,‎ go.
  Please, Mom, can you let me go to her party?‎
1913, Joseph C. Lincoln, chapter 6, Mr. Pratt's Patients:
  He had one hand on the bounce bottle—and he'd never let go of that since he got back to the table—but he had a handkerchief in the other and was swabbing his deadlights with it.
  You're hurting him! Let him go!
  Let go of the phone.
To emotionally disengage or to distract oneself from a situation.
2010, Gary Haymes, Go Beyond Stress
  You are supported, so you can just let go and relax. Inhale and slowly exhale.
  The secretary didn't work out, so her boss told her she was being let go.‎
  Wow, dude! You've really let yourself go this time!