
platzen
to burst
To suddenly tear open or break apart with a sound because of too much internal pressure or external force.
Der Autoreifen ist auf der Autobahn geplatzt.
The car tire burst on the highway.
to burst
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to burst
To suddenly tear open or break apart with a sound because of too much internal pressure or external force.
Der Autoreifen ist auf der Autobahn geplatzt.
The car tire burst on the highway.

to fall through
To fail unexpectedly or not come about. Often refers to plans, dreams, appointments, or business deals.
Die geplante Fusion der beiden Unternehmen ist in letzter Minute geplatzt.
The planned merger of the two companies fell through at the last minute.

to be bursting
Figurative for a state of extreme fullness or tension, often in reference to rooms or emotions.
Der Saal platzte aus allen Nähten, so viele Leute waren da.
The hall was bursting at the seams; there were so many people there.

to burst with
To be overwhelmed by a strong feeling such as anger, curiosity, pride, or impatience and hardly be able to hold it back.
Als er die Ungerechtigkeit sah, platzte er fast vor Wut.
When he saw the injustice, he almost burst with anger.
Since 'platzen' (to burst) describes a sudden change of state or movement, the German perfect tense is always formed with the auxiliary verb 'sein' (to be), not with 'haben' (to have). This is a common mistake.
Der Luftballon ist mit einem lauten Knall geplatzt.
The balloon burst with a loud bang.
The meaning of 'platzen' (to burst / to fall through) depends on the subject. If it is a concrete object (tire, pipe), it means 'zerbersten' (to burst apart). If it is something abstract (plan, dream, deal), it means 'scheitern' (to fail).
Das Wasserrohr ist im Keller geplatzt.
The water pipe burst in the basement.
In the literal meaning, 'platzen' (to burst) is often used for things that are under pressure. Typical examples are a tire, a balloon, a pipe, or a fruit.
Die Kirschen sind nach dem starken Regen geplatzt.
The cherries burst after the heavy rain.
In the figurative sense, 'platzen' (to fall through) is used for abstract things that are not realized. Common combinations are: a plan falls through, a dream is shattered, a deal falls through, or a wedding is called off.
Leider ist die geplante Hochzeit geplatzt.
Unfortunately, the planned wedding was called off.
The idiom 'aus allen Nähten platzen' (to be bursting at the seams) is used to describe that a room, building, or means of transport is extremely full.
Der Bus am Morgen platzte aus allen Nähten.
The morning bus was bursting at the seams.
When 'platzen' (to burst) describes a strong feeling, it is always used with the preposition 'vor' and a noun in the dative. Typical feelings are anger, envy, pride, or curiosity.
Er platzte fast vor Neid, als er das neue Auto seines Nachbarn sah.
He almost burst with envy when he saw his neighbor's new car.
to fail
For a business deal, scheitern generally means that it does not come about successfully. Platzen emphasizes the unexpected or abrupt collapse of the agreement. Use scheitern for an simply unsuccessful outcome; when there is a surprising cancellation, platzen is more fitting.

Kurz vor der Unterschrift platzte das Geschäft durch die überraschende Absage des Käufers.
The deal fell through just before the contract was signed because the buyer unexpectedly pulled out.
Nach langen Verhandlungen scheiterte das Geschäft an unterschiedlichen Preisvorstellungen.
After lengthy negotiations, the deal failed because the parties had different ideas about the price.