blow up verb 24blow-up noun 2blow-up adjective 1forms 5 verb24 •To explode or be destroyed by explosion.Why do cars in movies always blow up when they fall off a cliff? •To cause (something or someone) to explode, or to destroy (something) or maim or kill (someone) by means of an explosion.We had to blow up the bridge before the enemy army arrived.More civilians than soldiers have been blown up by anti-personnel mines. •To inflate or fill with air, either by literally blowing or by using a pump.For the school science project, each student will blow up a balloon and then tie it closed. •(slang) To become much more fat or rotund in a short space of time. •(old-fashioned) To inflate, as with pride, self-conceit, etc.; to puff up.blown up with high conceits engendering pride — 1667 •(slang) To suddenly get very angry, to lose one's temper.Dad blew up at me when I told him I was pregnant. •(old-fashioned) To scold violently, blow up at.#*: I have blown him up well — nobody can say I wink at what he does. — 1871 •To enlarge or zoom in on.Blow up the picture to get a better look at their faces. •(figurative) To represent something as being more important or serious than it actually is; to inflate; to exaggerate.The foreign secretary David Miliband's emphasis that this is purely a consular matter is intended to forestall an attempt by Iranian hardliners to blow the incident up. — 2009 •(slang) To become popular very quickly.This album is about to blow up; they’re being promoted on MTV. •(slang) To overwhelm through unexpectedly high demand, activity, usage, traffic volume, etc.I blew up another department's API servers – did I screw up or should they have more protections? — 2024 •(slang) To overwhelm (a place) with traffic or volume by revealing its existence to others.Be cool! Keep it on the down low. Don't blow up my spot! •(slang) To bombard with a large number of calls, texts, or notifications, to the point of rendering temporarily unusable or exasperating the recipient.I had to mute the notifications for that group text. Those hooligans kept blowing up my phone. •(slang) To be overwhelmed by unexpectedly high demand, usage, activity, traffic volume, etc.There were so many incoming enemy planes that our monitoring and notification system blew up before the base was even able to respond. •(slang) To be overwhelmed with traffic or volume.Damn, my spot blew up. Time to find the next one. •(slang) To receive a large number of calls, texts, or notifications, to the point of being rendered temporarily unusable or exasperating the recipient.one's phone is blowing upI had to mute the notifications for that group text. My phone kept blowing up every day. •To fail disastrously.So I wish you luck, but don't come crying to me when it blows up in your face. — 2002 •To begin; to gather; to form.A storm is blowing up in the north. •(old-fashioned) To excite. •To increase without bound as a function argument or parameter approaches a certain value; to tend toward infinity; to approach infinity as a limit.The quantity 1/x blows up as x approaches zero. •To succumb to oxygen debt and lose the ability to maintain pace in a race. •(informal, slang) To cause a malodorous smell by flatulation, defecation, etc.Don't go in there...I really blew it up. •To blow the whistle. •(slang, old-fashioned) To use an intoxicating drug; to get high. blow-up noun2 •(informal) An explosion (physical or emotional).I heard Jen's blow-up from the next room. •(informal) An enlargement (e.g. of a photograph).Make a blow-up of the chart so we have more room to draw on it. blow-up adjective1 •Inflatable; able to be blown up.The kids played with a blow-up sea-monster in the pool. formsblew up · blown up · blowing up · blows up · blow-ups