(genetics) A genetically modified organism that carries one or more genes in its chromosomes that has been made less active or had its expression reduced.
(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.
(nautical) The condition of a sailboat being pushed abruptly to horizontal, with the mast parallel to the water surface.
(soccer) a short pass played downwards, for example from the head onto someone's feet.
(automotive)Preignition, a type of abnormalcombustion occurring in spark ignition engines caused by self-ignition or the characteristic knocking sound associated with it.
“One of my students received a knock to the door of her unconscious when she read Eudora Welty's story of the traveling salesman.”
“All of them are speaking of points of contact between the tool and matter. A crash, an impact, a knock between two different materials, to make us understand and feel the instant of time.”
“He nearly jumped out of his skin when he heard a knock on the door.”
knockback
A blow that causes the recipient to fall or move backwards, a knockback; a recoil.
Something that impedes or reverses progress; a setback.