knock up against

碰撞；同…冲突

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, knock sb/sth over, knock sth back, knock sth in; knock sth into sth, knock sth together, knock up, knock-down, knock-kneed, knock-on, knock-out, knock-up, knockabout, knocker, knoll, knot, knot-hole, knotty, know, know about, know better than, know no bounds, know of, know sb. by name, know-all, know-how, knowing,