To make a soft sucking sound, or to suppress or crush something completely.
Possibly imitative in origin, appearing in English in the 1600s. It may be influenced by 'squash' and 'belch,' creating a word that mimics the muddy, wet sound it describes.
This word is wonderfully onomatopoetic—if you say it out loud while thinking about walking through mud, your mouth almost makes the sound! It's one of English's most playful-sounding words.
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