mould

• pattern or form for giving a particular shape; something that has been molded; nature, character; decorative edging, patterned rim; fungal growth (also mold)
fashion, shape; shape or form in a mold; become moldy, mildew; determine the nature of; ornament with molding, trim with edging; influence the character of (also mold)
loose rich soil (also mold)
to mould someone or something means to change or influence them over a period of time so that they develop in a particular way.
if you mould plastic or clay, you make it into a particular shape.
a mould is a container that is used to make substances such as metal into a particular shape. you pour a liquid into the mould, and when it becomes solid you take it out.
mould is a soft grey, green, or blue substance that sometimes forms on old food or on damp walls or clothes.