squish

To squeeze or crush together or into a flat mass; squash.

To emit the gurgling or sucking sound of soft mud being walked on.

A squishing sound.

A person regarded as weak and ineffective.

A sound like that made by the feet of one walking in mud or slush; a gushing, swashing, or splashing sound; a squishing sound.

To make the sound of squirting water, like that made by the feet of one walking in mud or slush; to make a kind of gushing, swashing, or splashing sound; to move with such a sound.

A political moderate (derogatory term used by conservative activists in the 1980s)

To squeeze, compress, or crush.

walk through mud or mire

the noise of soft mud being walked on