
giessen
to water
To provide plants with water.
Im Sommer muss ich meine Balkonblumen jeden Tag gießen.
In summer, I have to water my balcony flowers every day.
to water / pour
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to water
To provide plants with water.
Im Sommer muss ich meine Balkonblumen jeden Tag gießen.
In summer, I have to water my balcony flowers every day.

to pour
To pour a liquid from one container into another.
Kannst du mir bitte noch etwas Tee in die Tasse gießen?
Could you please pour me a little more tea into the cup?

it is pouring
To rain very heavily. Often used in the expression 'es gießt in Strömen' (it is pouring with rain).
Wir können jetzt nicht rausgehen, es gießt wie aus Eimern.
We can't go out now; it's pouring buckets.

to cast
To fill a mold with molten material, usually metal, in order to make an object.
Die Figur wurde aus flüssiger Bronze in eine Sandform gegossen.
The figure was cast from liquid bronze in a sand mold.
The spelling 'giessen' with 'ss' is common in Switzerland. In Germany and Austria, this word is written 'gießen' with 'ß'.
Vergiss bitte nicht, die Blumen zu gießen.
Please don't forget to water the flowers.
The meaning of 'gießen' (to water / pour) is easy to recognize from context: Does it refer to plants, drinks, the weather, or the production of objects made of metal?
Der Gärtner goss die jungen Bäume.
The gardener watered the young trees.
When it is about plants, the most common objects are 'Blumen' (flowers), 'Pflanzen' (plants), 'den Rasen' (the lawn), or 'den Garten' (the garden).
Nach dem Urlaub mussten wir als Erstes den Garten gießen.
After the vacation, the first thing we had to do was water the garden.
When pouring liquids, a prepositional phrase with 'in' and the accusative often follows to indicate the destination. For example: 'etwas in die Tasse gießen' (to pour something into the cup).
Sie goss die heiße Suppe in die Teller.
She poured the hot soup into the bowls.
To describe heavy rain, the impersonal form 'es gießt' (it is pouring) is used. This is often intensified with 'in Strömen' (in streams / heavily) or 'wie aus Eimern' (as if from buckets).
Nimm einen Schirm mit, es gießt in Strömen!
Take an umbrella with you; it's pouring with rain!
This meaning belongs to the technical language of metalworking or art. Typical objects are 'Glocken' (bells), 'Figuren' (figures), or 'Statuen' (statues).
In dieser Werkstatt werden traditionell Glocken aus Bronze gegossen.
In this workshop, bells are traditionally cast from bronze.
to fill
Füllen focuses on the container and on making it full. Giessen, by contrast, refers to liquid moving from one container into another; the destination does not have to become full. Füllen fits the result, while giessen fits the process.

Mara gießt etwas Wasser aus dem Krug in das Glas.
Mara pours some water from the pitcher into the glass.
Mara füllt das Glas bis zum Rand mit Wasser.
Mara fills the glass to the brim with water.