Impartial or generic word for both stretch/dilate and squeeze/compress
How about deform:
Distort the shape or form of; make misshapen.
Another possibility, suggested by the above, is distort:
Pull or twist out of shape.
How about deform:
Distort the shape or form of; make misshapen.
Another possibility, suggested by the above, is distort:
Pull or twist out of shape.