v. 1
To fill or obstruct (something) so that it is not possible to pass.
The pipe was blocked by leaves.
v. 2
To prevent (something or someone) from passing.
A broken-down car is blocking the traffic.
n. 1
Something that prevents something from passing.
There’s a block in the pipe that means the water can’t get through.
n. 2
Something that prevents something from passing. An action to interfere with the movement of an opposing player or of the object of play (ball, puck). A shot played by holding the bat vertically in the path of the ball, so that it loses momentum and drops to the ground.

Related words

Word family: blockbuster blockade blocker blockface blockfield blockfront blockheaded blockish
Phrases: block off block up stumbling block tenji block cinder block clinker block chopping block gin block

Forms

Plural: blocks → blockages, barriers, obstructions, closures…
Past participle: blocked
e.g. blocked → obstructed, hindered, blockaded, stymied…

hole Just once, I'd like to get a hole-in-one some day.
blockade Israel should lift the blockade it imposed on Gaza.
embarrass I doubt very seriously that that'll embarrass Tom.
stymie Parents should be careful not to stymie the individuation of their children.
seal Let me add a few words before you seal the letter.

Use in printed books, per decade from 1850 to 2019.

3 letters: set¹, bar¹, jam¹, lug¹
4 letters: stop¹, head¹, bank¹, wall¹, hole¹, fill¹, cake¹, roof¹, seal¹, plug¹, foul¹, cube¹, lump¹, cloy¹
5 letters: close¹, stuff¹, choke¹, parry², chock¹
6 letters: forget², square¹, arrest², freeze¹, oppose², hinder², impede², pulley², stymie²
7 letters: barrier³, closure², cluster², deflect², occlude
8 letters: blockade², stoppage², obstruct², blockage², encumber³, obturate
9 letters: embarrass³, barricade³, occlusion³
10 letters: immobilize⁴, immobilise
11 letters: obstruction³

The small number after each word is its number of syllables (parry² = 2 syllables).