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