Well Mary. from the post right above mine, I believe you have defined pot committed with your question. However, never .. ever... call a hand you know has been beaten as this will bring you from "Pot Committed"
to "Should Be Committed"
Just an opinion, but I believe at no time its too late to fold and run like hell as there is only 1 hand that can't be beat and face it, everyone has been in the situation where the river comes up to complete an open ended while your holding your trips and have been swinging hard.
Don't fear Common Sence
Fold and run like you have never ran b4
See you on the tables,