WordNet sense 1 (a drink in honor of or to the health of a person or event):

toast

WordNet sense 2 (a binding commitment to do or give or refrain from something):

assurance

WordNet sense 3 (pay (an amount of money) as a contribution to a charity or service, especially at regular intervals):

subscribe

WordNet sense 4 (propose a toast to):

drink, salute, wassail

WordNet sense 5 (promise solemnly and formally):

plight