Aposiopesis

He broke off again. His eyes filled, and he pressed a fist against his mouth, his shoulders heaving once, twice. The judge leaned forward, a look of grim pity on her face.

is a rhetorical device where a speaker suddenly breaks off a sentence, leaving it unfinished, usually because they are overwhelmed by emotion or because the thought is too unspeakable to articulate. aposiopesis

He stopped. His jaw tightened, and he looked down at his shaking hands. "Like what, Mr. Vance?" the prosecutor prompted gently. He broke off again