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plug up

plug up

 
See:
plug
part of speech: phrase
definition 1: to block the flow of a liquid or gas through (something).
Hair is always plugging up the bathtub drain.Wax sometimes plugs up her ears.
definition 2: to create a barrier to block the flow of a liquid or gas through (something).
Cold air is coming through these holes, so we need to plug them up.