
verstopfen
to clog
To block a passage, such as a pipe, drain, or opening, so that liquids or other things can no longer flow through it.
Die Haare haben den Abfluss in der Dusche verstopft.
The hair clogged the drain in the shower.
to clog / to block
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to clog
To block a passage, such as a pipe, drain, or opening, so that liquids or other things can no longer flow through it.
Die Haare haben den Abfluss in der Dusche verstopft.
The hair clogged the drain in the shower.

to constipate
To block the intestines so that normal bowel movement becomes difficult or impossible; to cause constipation.
Zu viele Bananen können bei Kleinkindern den Darm verstopfen.
Too many bananas can constipate toddlers.

to clog / block
To block a road or path so that traffic can no longer flow and a traffic jam occurs.
Ein Unfall hat die Autobahn auf mehreren Kilometern verstopft.
An accident clogged the highway for several kilometers.
The verb is derived from 'stopfen' (to stuff, to cram). The inseparable prefix 'ver-' intensifies the meaning and indicates that the action leads to a complete blockage.
Alte Blätter verstopfen oft die Regenrinne.
Old leaves often clog the gutter.
You can use the verb actively to name the cause of the blockage (X verstopft Y). Very often, however, the stative passive (Y ist verstopft) is also used to describe the blocked state.
Das Fett verstopft den Abfluss.
The grease clogs the drain.
The object of the verb makes the meaning clear. With 'Rohr' (pipe) or 'Abfluss' (drain), it refers to a physical blockage. With 'Straße' (road) or 'Autobahn' (highway), it means a traffic jam. In a medical context, it refers to the intestines.
Ein umgefallener Baum verstopft die Landstraße.
A fallen tree is blocking the country road.
When referring to drains or pipes, the typical things that clog something are 'Haare' (hair), 'Fett' (grease), or 'Essensreste' (food scraps).
Man sollte kein heißes Fett in den Abfluss gießen, weil es ihn verstopfen kann.
You shouldn't pour hot grease down the drain because it can clog it.
to block
Blockieren generally means making a passage impassable. Verstopfen is used especially when accumulated substances or objects prevent flow through a pipe or drain. Thus, a single obstacle can block something, while hair, for example, can clog a drain.

Haare und Seifenreste verstopfen den Abfluss des Waschbeckens.
Hair and soap residue are clogging the sink drain.
Ein kleiner Deckel blockiert den Abfluss des Waschbeckens.
A small lid is blocking the sink drain.