
spritzen
to inject
To inject a liquid into the body or an object with a syringe.
Die Ärztin musste ihm ein Schmerzmittel spritzen.
The doctor had to inject him with a painkiller.
to inject / spray
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to inject
To inject a liquid into the body or an object with a syringe.
Die Ärztin musste ihm ein Schmerzmittel spritzen.
The doctor had to inject him with a painkiller.

to spray
To release or distribute a liquid in a stream or as a mist.
Die Kinder spritzten sich im Sommer mit Wasserpistolen nass.
In the summer, the children sprayed each other wet with water pistols.

to pipe
To apply a soft mass such as whipped cream or dough in a shaped way using a piping bag.
Sie spritzte kleine Sahnetupfer auf die Torte.
She piped small dollops of whipped cream onto the cake.

to spray
To apply paint or varnish to a surface with a spray gun.
Der Lackierer muss die Autotür komplett neu spritzen.
The painter has to completely respray the car door.
The verb 'spritzen' (to inject/spray) is closely connected to the noun 'die Spritze' (syringe; sprayer). A 'Spritze' is the tool used to inject or spray liquids, which explains the basic meaning of the verb.
Der Gärtner füllte die Spritze mit Wasser, um die Pflanzen zu spritzen.
The gardener filled the sprayer with water to spray the plants.
In medical contexts, 'spritzen' (to inject) is often used with two objects: the person receiving the injection is in the dative, and the medication is in the accusative.
Der Arzt spritzte dem Patienten ein starkes Schmerzmittel.
The doctor injected the patient with a strong painkiller.
In its medical meaning, the verb is often combined with words like 'Insulin' (insulin), 'ein Medikament' (a medication), 'eine Impfung' (a vaccination), or 'ein Betäubungsmittel' (an anesthetic).
Diabetiker müssen sich regelmäßig Insulin spritzen.
Diabetics have to inject themselves with insulin regularly.
When you spray a person or thing with a liquid, you often use the structure: 'jemanden/etwas mit etwas (Dativ) spritzen' (to spray someone/something with something).
Er hat mich aus Versehen mit dem Gartenschlauch nass gespritzt.
He accidentally sprayed me wet with the garden hose.
In connection with baking and cooking, 'spritzen' (to pipe) means to apply a soft mass such as whipped cream or dough with a piping bag. Typical objects are 'Sahne' (whipped cream), 'Creme' (cream), or 'Verzierungen' (decorations).
Für die Dekoration spritzte sie kleine Schokoladenherzen auf den Kuchen.
For the decoration, she piped small chocolate hearts onto the cake.
When it comes to craftwork or industry, 'spritzen' often means to apply paint or varnish with a spray gun. You can recognize this meaning from words like 'Lack' (varnish/paint), 'Farbe' (paint), 'Auto' (car), or 'Wand' (wall).
Die Werkstatt muss den ganzen Kotflügel neu spritzen.
The workshop has to respray the whole fender.
to blast / exceed
Spritzen and sprengen can both refer to distributing water. Spritzen tends to emphasize the stream coming out or larger drops, while sprengen is especially common for watering a lawn or garden over a broad area. Use spritzen for a stream of water and usually sprengen for the area being watered.

Der Gartenschlauch spritzt einen kräftigen Wasserstrahl auf den trockenen Rasen.
The garden hose sprays a powerful stream of water onto the dry lawn.
Wir sprengen am Abend den ganzen Rasen, weil es seit Tagen nicht geregnet hat.
We water the entire lawn in the evening because it has not rained for days.