behindbehind2 prepositionprep1be behind somebody/something to support a person, an idea, or the work they are doingCabinet Ministers rallied behind the Prime Minister yesterday.
2not as advanced or successful as someone or something elseTheir social and economic development is so far behind the rest of the world that they can never compete on equal terms.
3behind schedule not arriving or happening at the right timeCommuters were delayed for up to 35 minutes as trains ran behind schedule.
Contractors who fall behind schedule will incur financial penalties.