stip = to press together

词根stip来自拉丁语stip意为to press together。
1.stipulate [使一起按压stip(=press together)]
vt.（作为条件）讲定，约定，规定；确定，保证
stipulation n.约定，规定；条款
I stipulated that the company pay my moving expenses before accepting the job. 我要求那家公司先支付我搬家的费用，然后我才会接受这份工作。

2.constipate v.使患便秘 *con<com(=intensive)
constipated adj.便秘的
constipation n.便秘
find some kinds of food constipating 发现一些引起便秘的食物