What is the meaning of 하다?

to be many

to be big; to be many

to do; used to vaguely refer to almost any action, in particular:

to prepare, to make (food, clothes, etc.)

to make a certain facial expression

to have, to eat

to wear, to put on (accessories such as hats or jewelry)

to run (an enterprise, etc.)

to be, to take the responsibility of... (a charge, a role)

to get (a result)

to cost, to be worth (a certain price)

to treat, to deal with

to acquire (an object, by purchase or other arrangement)

to say (that):

to say (that)

to be like; to say (that)

to call, to name

to go; make the sound of the onomatopoeia; to act according to the ideophone

to wonder, to ponder

to make, to render:

1. to decide on; to make; to use (as)

   to decide on; to make; to use (as)

   to decide

   to cause to face

   to treat (in a certain way)

   See -어하다 (-eohada, “to consider (as); to find (as)”).

   Used as a light verb to allow nouns and noun-like forms to function as active verbs. The verb itself has little to no real meaning. The noun functions as a direct object of the verb, being able to take particles such as the accusative case marker -을 or the topic marker -은.

   Used as a light verb to allow nouns and noun-like forms to function as adjectives. The verb itself has little to no real meaning. The noun can be separated by the topic marker -은.

   After certain roots, fully suffixed to form an inseparable verb or adjective. Such roots tend to be single-character Sino-Korean morphemes.

   Used with no real meaning after a verb or adjective nominalized with -기 and followed by a particle.

   Used as the neutral verbal element after suffixes expressing intent.

   Used as the neutral verbal element for constructions with repeated suffixes.

   and all; used after -고 to emphasize a suffix expressing causation.

   Various idiomatic usages:

   1. See -게 하다 (-ge hada, “to make; ”).
   2. See -고는 하다 (-goneun hada, “[one] would [customarily]...”).
   3. See -다 하면 (-da hamyeon, “if... always”).
   4. See -어야 하다 (-eoya hada, “must; should; have to”).
   5. See -었으면 하다 (-eosseumyeon hada, “to wish; to hope”).
   6. See -으로 하여 (-euro hayeo, “because of; via”).
   7. See -쯤 해서 (-jjeum haeseo, “around the time...”).
   8. See -하고 (-hago, “and, with”).
   9. See 하면 (hamyeon, “as for”).
   10. See 할 것 없다 (hal geot eopda, “to have no need to distinguish”).

   See -게 하다 (-ge hada, “to make; ”).

   See -고는 하다 (-goneun hada, “[one] would [customarily]...”).

   See -다 하면 (-da hamyeon, “if... always”).

   See -어야 하다 (-eoya hada, “must; should; have to”).

   See -었으면 하다 (-eosseumyeon hada, “to wish; to hope”).

   See -으로 하여 (-euro hayeo, “because of; via”).

   See -쯤 해서 (-jjeum haeseo, “around the time...”).

   See -하고 (-hago, “and, with”).

   See 하면 (hamyeon, “as for”).

   See 할 것 없다 (hal geot eopda, “to have no need to distinguish”).

   Source: wiktionary.org