usage: corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones; "adulterate liquor"
10. extend, stretch, increase
usage: increase in quantity or bulk by adding a cheaper substance; "stretch the soup by adding some more cream"; "extend the casserole with a little rice"
11. stretch, stretch out, move
usage: extend one's body or limbs; "Let's stretch for a minute--we've been sitting here for over 3 hours"