to considerably alter something, to adulterate, mix

spoil one's tongue, use foul language, use wrong words or idioms

to become unidiomatic, (of someone) be using foul language

bad, obscene or rude language, tendency to use abusive language

be fickle, not to stick to one's words

tongue-twister

Foulmouthed.

back out of one's word

talk fast, be facile, speak too much or impertinently

be very thirsty

foul-mouthed (person)

it is the tongue which makes or breaks, one's speech determines one's weed

(tongue) to dry