Hangul Syllable Daess

It has no fixed meaning on its own; the word decides.

In 댔다, 댔 is part of a past form of 대다, a verb that can mean putting or touching something, supplying it, or introducing someone. In 해 댔다, the pattern -어 대다 marks repeated or intensified action: the preceding action kept happening or was done insistently.

Hangul combines an initial consonant, a vowel, and sometimes a final consonant into one syllable block. A record of Hangul's creation dates to 1443; its explanatory book, Hunminjeongeum, was published in 1446 to make Korean easier to learn and use.

How do I type 댔?

Use a Korean input method and enter ㄷ, then ㅐ, then ㅆ.

On the common Dubeolsik two-set keyboard layout, those letters are E, O, then Shift+T. The input method joins the keystrokes into one block. If the individual Hangul letters, called jamo, remain separate, the text is in decomposed form rather than one precomposed block.

Unicode also allows this syllable to be stored in canonical decomposed form as ㄷ + ㅐ + ㅆ. A text inspector may show the component letters even when an app displays the same Korean syllable.