verb
BAD : When immersed in water, the cloth narrows.
GOOD : When immersed in water, the cloth shrinks.
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narrow (of roads, rivers, etc) = become less wide: 'Just beyond the bend, the river begins to narrow.'
shrink (especially of cloth) = become smaller as a result of being wet or placed in water: 'I suggest you buy the larger size just in case it shrinks.'