Overview of noun subbing

The noun subbing has 1 sense

• subbing, substituting -- (working as a substitute for someone who is ill or on leave of absence)

Overview of verb sub

The verb sub has 1 sense

• substitute, sub, stand in, fill in -- (be a substitute; "The young teacher had to substitute for the sick colleague"; "The skim milk substitutes for cream--we are on a strict diet")