knockdown

1. (slang, obsolete, uncountable) Very strong ale or beer.obsoleteslanguncountable

2. (genetics) A genetically modified organism that carries one or more genes in its chromosomes that have been made less active or had their expression reduced.countableuncountable

3. (genetics) The use of a reagent such as an oligonucleotide with sequence complementary to an active gene or its mRNA transcript, to interfere with the expression of said gene.countableuncountable

4. (nautical) The condition of a sailboat being pushed abruptly to horizontal, with the mast parallel to the water surface.countableuncountable

5. (soccer) a short pass played downwards, for example from the head onto someone's feet.Examples: "Pires, a three-time Cup winner with Arsenal who scored the Gunners' winner against Southampton in the 2003 final, has been a largely peripheral figure at Villa Park since joining in November - but the 37-year-old rolled back the years with a fine finish from Delfouneso's knockdown."countableuncountable

6. (film, television) A shelter erected for use as a temporary dressing room.Examples: "We shot 'The Caterpillar' at General Service Studios, and the dressing rooms for the actors were what they call knockdowns: wooden frames covered in grungy, dirty red canvas. It looked like a circus tent."countableuncountable