What is the meaning of -d?

Alternative form of -ed now only standard with words which end in -e, but historically permissable in all the same places as -ed.

An empty suffix, perhaps derived from the past-tense suffix above, added in some dialects to the present tense forms of some words which then add an additional -ed in the past tense.

Marks ordinals written in digits when the final term of the spelled number is "second" or "third"

Forms the nominative and accusative plural.

-th, -ness

your (second-person singular informal, single possession)

Second-person singular personal suffix:

1. Definite forms of transitive verbs (followed by a linking vowel in indicative present/past and subjunctive moods; with no linking vowel in conditional mood).

   Definite forms of transitive verbs (followed by a linking vowel in indicative present/past and subjunctive moods; with no linking vowel in conditional mood).

   Combined form of a covert (∅) allophone of -j (subjunctive suffix) and the regular suffix -(a/e)d (above), marking the short form of the above person of the definite subjunctive (attached directly to a verb stem).

   Forming conjugated infinitives (here: “for you to do sth”).

   Declined and postpositional forms of the second-person personal pronoun te (“you”).

   Originally, it was probably a diminutive suffix. In this sense, it is no longer productive. It can be found in place names, given names, and a few other words.

   A frequentative suffix or denoting the beginning of a process.

   Added to a cardinal number to form a fraction. It is used with a linking vowel, see -ad, -od, -ed, -öd.

   alternative form of -t (“under, within”)

   denotes an action performed on someone or something else (transitive suffix; allows for a direct complement patient, creating a patient-oriented verb)

   alternative form of -th

   alternative form of -the (ordinal suffix)

   An inflectional suffix forming the supine of certain weak verbs, used with an auxiliary to form the perfect tenses.

   Forming the corresponding basic indefinite form of the past participle.

   A suffix denoting the third-person singular conjunct form of an animate intransitive verb (vai)

   A suffix denoting the third-person singular conjunct form of an animate intransitive verb with an object (vai+o)

   A suffix denoting the third-person singular conjunct form of a Type 3 inanimate transitive verb (vti3)

   A suffix denoting the third-person singular to first-person singular conjunct form of a transitive animate verb (vta) with Cw ending

   Suffix to form the past participle of weakly inflected verbs, to be used when the corresponding participle belongs with a common noun in indefinite singular form.

   Used to form abstract nouns from verbs, adjectives or other nouns

   Used to form nouns from verbs

   Source: wiktionary.org