Progressive squeeze
Encyclopedia
The progressive squeeze (also termed a "repeating squeeze") is a 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...

squeeze
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...

that gains two tricks by squeezing one and the same player twice, hence the name. A progressive squeezes is a subset of triple squeeze
Triple squeeze
A triple squeeze is a squeeze against one player, in three suits; a more explicit definition is "three simple squeezes against the same player."...

s that, depending both on entries and on positional factors, may result in a subsequent, simple, two-suit squeeze that takes place against the opponent who has just been triple squeezed. Confusing the issue is that some triple squeezes can become progressive squeezes through misdefense.

Examples

The first diagram
Contract bridge diagram
The diagram is typical of that used to illustrate a deal of 52 cards in four hands in the game of contract bridge. Each hand is designated by a point on the compass and so North-South are partners against East-West.Suit features include:...

shows a basic example:
When the ace of clubs is cashed East is squeezed and has to discard one of his red aces, the established king is cashed (this is the progressive squeeze card) and East is squeezed for another trick.

In the above example an extended menace, threatening the immediate loss of two tricks was present. That is not always necessary, a progressive squeeze still works if we have an additional entry as compensation.
When the ace of clubs is cashed East can either discard the diamond ace, after which the diamond king will seal his fate, or bare one of his major suit
Major suit
In the card game contract bridge, the major suits are spades and hearts . The major suits are of prime importance for tactics and scoring as they outrank the minor suits while bidding and also outscore them...

holdings in which case the jack in that suit will be the progressive squeeze card. Had West East's cards the best defense to discard a spade will break the second squeeze.