coc,coct = to cook,to mature

1.concoct（放在一起做飯、烹飪con<com(=together) + coct(=cook)）
vt.調(diào)制；調(diào)和；編造；圖謀
concoction n.混合（物），調(diào)和（物）；編造
Policemen say that speeders often concoct hilarious excuses for speeding. 警察說超速駕駛的人往往會(huì)編造一些可笑的借口。

2.precocious（早一點(diǎn)成熟的pre (=before) + coc(=mature,cook)）
precocity n.早熟
She's a precocious tot. She could already read at 3.她是個(gè)早慧的孩子，三歲的時(shí)候就會(huì)識(shí)字讀書了。

3.decoct
v.煎，熬 *de(=intensive,down)
decoction n.熬；煎制的藥劑