bluten
to bleed
To lose blood from a wound or a body opening.
Nach dem Sturz vom Fahrrad hat mein Knie stark geblutet.
After falling off the bike, my knee bled heavily.

to bleed
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to bleed
To lose blood from a wound or a body opening.
Nach dem Sturz vom Fahrrad hat mein Knie stark geblutet.
After falling off the bike, my knee bled heavily.

The verb 'bluten' (to bleed) is directly connected to the noun 'das Blut' (blood). When you bleed, you lose blood.
Überall auf dem Boden war Blut.
There was blood all over the floor.
Although 'bluten' (to bleed) describes a kind of change, the perfect tense is always formed with the auxiliary verb 'haben' (to have), not with 'sein' (to be).
Er hat nach dem Zahnarztbesuch noch lange geblutet.
He bled for a long time after the dentist appointment.
To name the place that is bleeding, you usually use the preposition 'aus' (from/out of) with dative or 'an' (on/at) with dative.
Das Kind blutet aus der Nase.
The child is bleeding from the nose.
In the colloquial meaning 'to pay a lot of money', the preposition 'für' (for) is often used to state the reason for the high costs.
Für das neue Dach mussten wir ganz schön bluten.
We really had to pay dearly for the new roof.
to get lost / to proceed
'verlaufen' and 'bluten' can both describe color not staying neatly in place. 'verlaufen' is used generally when color or liquid flows into something else uncontrollably and the shape becomes blurred. 'bluten' is more technical in this sense and is especially used in printing: ink runs beyond the intended area or shows through paper. Learners may confuse the words because both occur with color and edges. In everyday language, 'verlaufen' is usually more natural; 'bluten' mainly fits printing or design contexts.

Beim Druck blutet die rote Farbe leicht über den Rand.
In printing, the red ink bleeds slightly over the edge.
Der Text ist nass geworden, und die Tinte ist verlaufen.
The text got wet, and the ink ran.