that will do meaning

• [American slang]
  Informal expression of impatience meaning "stop," "no more." "That will do, Tommy," his mother cried. "I've had just about enough of your drumming on the table."
  

• do:    Verb: do (did,done ...
• do as:    do as sth BrE if s ...
• do by:    Verb: do byInterac ...

Examples

1. a precious lot of good that will do!
2. that will do for the marines!
3. that will do for the present.
4. that will do to be going on with .-child laughs wickedly
5. that will do-i forgive you now . shake hands