also: づく
suffix
relying entirely on; using solely
Attaches to nouns to express doing something by relying exclusively on that thing, often with a nuance of single-mindedness or lack of other resources.
彼は経験ずくでこの仕事を成功させた。
He succeeded in this job relying entirely on his experience.
金ずくで解決しようとするのはよくない。
Trying to solve it solely with money is not good.
suffix
with the sole purpose of
Attaches to nouns to indicate that the action is done for that purpose alone, often implying determination or exclusivity.
彼は出世ずくに働いている。
He works with the sole purpose of getting promoted.
suffix
based on (mutual consent, etc.)
Used with nouns like 話し合い (discussion) or 合意 (agreement) to mean something is done on the basis of that mutual understanding.
話し合いずくで決めましょう。
Let's decide based on mutual discussion.
Irregular okurigana usage; less common than 尽く.
頼り means reliance or dependence, often used in phrases like 頼りにする (to rely on). ずく is a suffix that attaches to nouns to express exclusive reliance or purpose, forming a compound adjective-like meaning.
一本 means 'one thing' or 'single-mindedly'. ずく can combine with nouns like 一本ずく to mean 'single-mindedly relying on one thing'.
Derived from the verb 尽くす (つくす, to exhaust or devote entirely). The suffix ずく/づく attaches to nouns to convey the idea of doing something exhaustively or exclusively with that thing.