That is a tough one. When I do that, I realize I'm in panic mode. And at that point, getting a word out will require either completely stopping & rephrasing the sentence... or closing my eyes & using some physical movement with my hand to help force the word out. Neither is ideal, but it gets the job done. When I recognize that I might screw up a word (or actually began to stutter & can't get it out), I search for an alternative word right away. One of my problem letters is W. So instead of saying "i like wavy lines"... I'll say "i like curvy lines". Is the meaning exactly the same? No. But it's my compromise. I can either (A) stutter & feel frustrated/mad/bad... or (B) say it slightly differently & feel better. Now if it's a specific word that can't change, like a person's name (Wilson, Wyatt, Wendy)... then God help me bc I can't substitute... and it just comes out eventually after silence. Sometimes a little smile, laugh, or deep exhale will help when I get into a panic block of silence. Sort of acts as a "reset button" for me. Or, if I know the outcome is just going to be bad, I'll be straight-up honest with people and tell them I have trouble saying that name/word & then try to say it again.