A single-suit squeeze is a unique
squeeze play

Squeeze play (bridge)

A squeeze play is a type of play late in the hand of contract bridge and other trick-taking game in which the play of a card forces an opponent to discard a card that gives up one or more tricks. The discarded card may be either a winner or a card needed to protect a winner...

 in contract bridge

Contract bridge

Contract bridge, usually known simply as bridge, is a trick-taking card game using a standard deck of 52 playing cards played by four players in two competing partnerships with partners sitting opposite each other around a small table...

that occurs with an awkward defensive distribution of one suit.
It is a kind of immaterial squeeze, in which a discard does not cost a
trick directly, but gives up a position, allowing the opponents to adopt a
winning line.

Example

The first example is a one-suit squeeze in which the victim can choose
between an endplay or a simple promotion:
If the five of diamonds is played, East must choose whether to discard the spade three or an intermediate honor.
By throwing the three East chooses an endplay

Endplay

An endplay , in bridge and similar games, is a tactical play where a defender is put on lead at a strategic moment, and then has to make a play that loses one or more tricks. Most commonly the losing play either constitutes a free finesse, or else it gives declarer a ruff and discard...

; South simply ducks a small
spade to East, who has to lead up to the king.
By throwing an intermediate honor, East allows for a promotion of the eight;
South leads the nine, West has to cover in order to avoid an endplay and the
eight will eventually become master.
Note that if the spade five and three were exchanged the squeeze still works.
East can choose between an endplay to the king, or an endplay to the eight.