grout

grout /gr'aʊt/ (grouts grouting grouted)
1 [N-UNCOUNT]
Grout is a thin mixture of sand, water, and cement or lime, which is used to fill in the spaces between tiles that are fixed to a wall.
2 [VERB] be V-ed, also V n
If you grout the tiles on a wall, you use grout to fill in the spaces between the tiles.
Make sure that your tiles are thoroughly grouted and sealed.

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