verb

• (transitive) To crowd into a place, especially to fill it.
  "By one o'clock the place was choc-a-bloc. […] The restaurant was packed, and the promenade between the two main courts and the subsidiary courts was thronged with healthy-looking youngish people, drawn to the Mecca of tennis from all parts of the country."
• (intransitive) To congregate.
  "[…]I have seen the dumb men throng to see him and / The blind to bear him speak:[…]"
• (transitive) To crowd or press, as persons; to oppress or annoy with a crowd of living beings.
  "Much people followed him, and thronged him."

adj

• (Northern England, Scotland) Filled with persons or objects; crowded.
  "Earth, sweet Earth, sweet landscape, with leavès throng / And louchèd low grass, heaven that dost appeal / To, with no tongue to plead, no heart to feel; / That canst but only be, but dost that long— […]"
• (Northern England, Scotland) Busy; hurried.
  "Mr Shaw was very civil; he said he was rather throng just now, but if Ernest did not mind the sound of hammering he should be very glad of a talk with him."