staunch

As an adjective, staunch means firm. You might want to go to that concert Friday night, but your parents' staunch opposition prevents you.

Staunch is sometimes used as a verb to mean "to stop the flow of a liquid," but most usage books will tell you it's better to use the word stanch for the verb. Think of a soldier stopping and standing still, and you will understand the connection between the two meanings. The adjectival form should make you think of "stand," as in “stand firm,” or "take a stand." It comes from the French estanche meaning “watertight” and the Latin stanticare, which is probably from stans for “stand.”

Primary Meanings of staunch

1.
adj
firm and dependable especially in loyalty
2.
v
stop the flow of a liquid
Full Definitions of staunch
1

adj firm and dependable especially in loyalty

“a staunch defender of free speech”
Synonyms:
steadfast, unswerving
constant
steadfast in purpose or devotion or affection
2

v stop the flow of a liquid

staunch the blood flow”
Synonyms:
halt, stanch, stem
Type of:
check
arrest the motion (of something) abruptly