Meaning

• A small amount of something, especially paste.

  "Put a dob of butter on the potato, please."

Meaning

• To report (a person) to someone in authority for a wrongdoing.

  "I’ll dob on you if you break in."

• To do one's share; to contribute.

  "We all dobbed in for a gift when he retired."

• To nominate a person, often in their absence, for an unpleasant task.

  "I arrived just after the meeting had started and found myself dobbed in to take the minutes."

• To play truant