Englishfor English speakers
rigid
Adjective
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A rigid object does not bend.
It's possible to use flexible materials to form a rigid structure.
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fixed rather than moving
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rigorous and unbending
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uncompromising
foam
Noun
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Foam is a substance that is full of bubbles.
A firm foam mattress can support your back just as well as other sleep surfaces.
A line of white foam appeared between his lips.
foam
Verb
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If someone is foaming, he is spewing saliva from his mouth as foam.
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If something foams, it form or gives off foam.
Add the butter to a large sauce pan and swirl until it begins to foam.