From Longman Dictionary of Contemporary Englishtouch down phrasal verb1 TTAARRIVEwhen an aircraft touches down, it lands on the ground The plane finally touched down at Heathrow airport around midday.2 in the sport of rugby, to score by putting the ball on the ground behind the other team’s goal line → touch→ See Verb table
Examples from the Corpus
touch down• The King's private plane touched down at Heathrow airport at exactly 12.15 this afternoon.• We will be touching down in about an hour's time. 