knife-edge

n (usu sing 通常作单数) 1 cutting edge of the blade of a knife 刀刃. 2 (idm 习语) on a knife-edge (a) (of a person) nervous (about the outcome of sth) （指人）（对某事物的结果）十分焦虑: He's on a knife-edge about his exam results. 他对考试成绩十分担心. (b) (of a situation, etc) at a critical point （指情况等）处於紧要关头: The success of the project is still very much on a knife-edge. 这一项目的成败目前仍处於关键时刻.

knavish, knavishly, knead, knee, knee-breeches, knee-deep, knee-high, knee-jerk, knee-length, kneecap, kneecapping, kneel, kneel down, knees-up, knell, knew, knick-knack (also nick-nack), knickerbockers, knickers, knife, knight, knight errant (pl knights errant), knighthood, knightly, knit, knitter, knitting, knitting-machine, knitting-needle, knitwear, knob, knobbly, knock, knock (sth) on, knock down, knock off, knock off (sth), knock out, knock sb down, knock sb out,