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1.
A hockey goalie who allows many goals to be scored by the other team, causing his team own team to lose the game.
Cornell beat Harvard in yesterday's hockey game because their sieve allowed five goals.
by Justin March 29, 2004
 
8.
a shitty goalie. Basically a duster, but as a goalie. Also known as a dehner.
That goalie is such a sieve
by Duster1234 April 15, 2012
 
9.
In general, a sieve separates wanted/desired elements from unwanted material using a tool such as a mesh, net or other filtration or distillation methods, but it is also used for classification of powders by particle size, or for size measurement as an analytical technique. The word "sift" derives from this term. A strainer is a type of sieve typically associated with separating liquids from solids.

Chemistry
Sieving coefficient, in transport phenomena

Mathematics
Sieve theory, a technique for counting or filtering sets of numbers
Sieve of Eratosthenes
General number field sieve
Large sieve
Sieve (category theory), a way of writing down how objects in a category glue to give other one

Computer science
Sieve (mail filtering language), a proposed standard for specifying mail filters
Sieve C++ Parallel Programming System, an auto-parallelizing compiler for C++
by CEEEEEBS September 18, 2008
 
10.
A sieve is someone who cannot control their urge to pass on other peoples stories or secrets, often exaggerating or taking anecdotes out of context; aiming to humiliate .

Verb: to sieve, (sieving, sieved)
1. "Ok, I'll tell you, but don't sieve this to anyone"

2. "My secret would've been safe, if it wasn't for that sieve"

3. Willy the Sieve
by Francis Hunt OG January 15, 2008
 
11.
1. Someone who cannot hold their liquor.
2. Slang for Bartender.
3. Someone stuck pouring beer from a keg.
4. Someone who shares their drink with others instead of finishing it themselves.
1. He is an irresponsible sieve.
2. Call the Sieve to take our orders.
3. He cannot mingle with the guests, he is stuck as Sieve.
4. She finishes all her drinks as a sieve.
by Keli Kear January 03, 2005