Only the brave know how to forgive...A coward never forgave; it is not in his nature. - Laurence Sterne.
When you are angry at someone for lying and he apologizes and you let it go and decide not to be angry any more, this is an example of a situation where you forgive.
Origin of forgive
- Middle English forgiven from Old English forgiefan ghabh- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition