To report (a person) to someone in authority for a wrongdoing.
To play truant
In the scouting movement, to chant dob to indicate that one will do one's best to follow the scouting laws.
To nominate a person, often in their absence, for an unpleasant task.
To do one's share; to contribute.
A small amount of something, especially paste.
To make a remark or provide information when it is inappropriate or indiscreet to do so, or when one does not have permission or the authority to do so.