Senses
抛砖引玉/ 拋磚引玉 to throw out a brick to attract jade
to offer one's own modest or humble remarks to spark more valuable ideas or contributions from others; often used as a polite self-deprecating expression
抛砖引玉/ 拋磚引玉 to sacrifice a little to gain much
to give up something of small value in order to obtain something of great value; to catch a fish with a worm