1) Descending 2) Omission 3) Plummeting 4) Plunging 1) Falling 2) Going down 3) In free fall 
• (p. pr. & vb. n.) of Drop • (n.) That which falls in drops; the excrement or dung of animals. • (n.) The action of causing to drop or of letting drop; falling.
Also known as lightening
Drop'ping noun 1. The action of causing to drop or of letting drop; falling. 2. plural That which falls in drops; the excrement or dung of animals. Dropping bottle , 
A sensation that is experienced by many pregnant women, normally towards the last month of the pregnancy as the fetus settles in the pelvis to prepare for birth. Breathing becomes easier as the pressure on the diaphragm lessens, although the need to urinate will increase due to the increase of pressure on the bladder. The abdomen will usually feel....
[adj] - falling rapidly 2. [adj] - coming down freely under the influence of gravity
falling adjective coming down freely under the influence of gravity; `the eerie whistle of dropping bombs`; `falling rain`
what a snowboarder shouts when he is 'dropping in' to warn others of his presence
the act of a person or thing that drops. · something that drops or falls in drops. · dung, esp. in the form of pellets.
Also known as lightening, dropping is when the fetus descends into the pelvic cavity in preparation for delivery. In first pregnancies, the baby often drops two to four weeks before delivery; in subsequent pregnancies, dropping often does not occur until labor.