To come open or fly apart suddenly or violently, especially from internal pressure. To explode. To be or seem to be full to the point of breaking open: The sacks were bursting with grain. To emerge, come forth, or arrive suddenly: burst out of the door. To come apart or seem to come apart because of overwhelming emotion: thought his heart would burst with happiness. To give sudden utterance or expression: burst out laughing; burst into tears. To cause to burst: burst the balloon. See Synonyms at break. To exert strong pressure in order to force (something) open. To separate (a continuous form or printout) into individual sheets. A sudden outbreak or outburst; an explosion. The result of bursting, especially the explosion of a projectile or bomb on impact or in the air. The number of bullets fired from an automatic weapon by one pull of the trigger. A volley of bullets fired from an automatic weapon: The machine gunner fired a quick burst. An abrupt, intense increase; a rush: a burst of speed; fitful bursts of wind. A period of intense activity: "I write in very short bursts\u201410 or 15 minutes\u201d ( Zoe Heller).