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caulk

caulk [or] calk

 
pronunciation:
kawk
part of speech: verb
inflections: calked, calking, calks, caulked, caulking, caulks
definition: to fill in cracks with putty or tar to keep air or water from leaking through.
He caulks the boat every spring before putting it in the water.
 
derivation: caulker (n.)