in the sense of guarantee
to promise or make certainWe guarantee to refund your money if you are not delighted with your purchase.
in the sense of pledge
to promise solemnlyI pledge that by next year we will have the problem solved.
in the sense of promise
to undertake to give (something to someone)They promised they would deliver it on Friday.
Video: pronunciation of 'stipulate'
stipulate 的词库—— 柯林斯 英语词库