What is the meaning of -st?

Verb suffix for the second-person singular; Alternative form of -est

Marks ordinals written in digits when the final term of the spelled number is "first"

Excrescent suffix (adding sound but largely not changing the meaning).

appended to the stem of a verb, this suffix yields a verbal noun; it is similar in function to the Dutch suffix -ing

appended to an adjective this suffix forms the superlative

partitive singular of -ne

turns verbs into middle voice verbs

Verb suffix for the second-person singular.

Forms superlatives of adjectives and adverbs, sometimes triggering umlaut.

Forms an adverb of manner.

turns verbs into middle voice verbs

Used to form adverbs of manner from adjectives; -ly

Used to form the elative case; out of

Forms the superlative of adjectives; -est

Used to form the second person singular present indicative of strong verbs and certain Class I weak verbs

Forms the superlative of adjectives; -est

Source: wiktionary.org