Abarim Publications' online Biblical Hebrew Dictionary
גמר
The verb גמר (gamar) means to complete, end or come to an end. It occurs only five times (all in the Psalms; Psalm 12:2, 77:9, 138:8, 7:10 and 57:3) and has the basic meaning of to complete, finish, but can also be used to indicate a sudden stop or termination. It has no derivations.